Platform/ARM/Driver: Introduce FtpmDxe driver for softwared based TPM with StandaloneMm

[LeviYeoReum]

FtpmDxe driver is a software-based TPM implementation built using the
[TPM 2.0 Reference Implementation Library][1] and the
[TPM Service Command Response Buffer Interface over FF-A][2] specification.

[The TPM 2.0 Reference Implementation Library][1] provides
the TPM functionality itself,
while [the TPM Service Command Response Buffer Interface over FF-A][2] defines
the communication mechanism between
the TPM and the system using FF-A (Firmware Framework for Arm A-profile).

With FtpmDxe driver, the platform where StandaloneMm is used
can use TPM functionality for:
- Block device encryption with LUKS using PCR.
- End-to-end measurement boot.

Patch #1-#4 add related information for FtpmDxe.
Patch #5 adds NV storage information used by FtpmDxe on VExpressPkg.
Patch #6 adds the PlatformTpmLib used by TpmLib for each platform.
Patch #7-#11 adds fTPM feature on VExpressPkg
Patch #12-#15 adds fTPM feature on JunoPkg
Patch #16-#18 adds feature for measured boot in VExpressPkg
Patch #19 adds feature for measured boot in JunoPkg
Patch #20 adds Readme.txt

Overview

Here is an overview how FtpmDxe works.

1. with UEFI

   UEFI (Normal world)	Secure World

                               |
   +--------------+            | +-----------+      +----------+
   |    Tcg2Dxe   |            | |  FtpmDxe  |<---->|  TpmLib  |
   +--------------+            | +-----------+      +----------+
           |                   |       |
           |                   |       ----------
           |                   |                |
           |                   |                |
           |                   |       +------------------+
           |                   |       | StandaloneMmCpu  |
           |                   |       +------------------+
           |                   |                |
           |                   |                |
           |                   |                |
   +----------------------+    |       +----------------------------+
   |  Tpm2InstanceFfaLib  |<---------->| StandaloneMmCoreEntryPoint |
   +----------------------+    .       |      (Misc Service)        |
                               .       +----------------------------+
                               .
                           Communicate via CRB over FF-A [0]
   

2. with linux-kernel

   linux (Normal world)	Secure World

                               |
   +----------------------+    | +-----------+      +----------+
   |  TPM infra-structure |    | |  FtpmDxe  |<---->|  TpmLib  |
   +----------------------+    | +-----------+      +----------+
           |                   |       |
           |                   |       ----------
           |                   |                |
           |                   |                |
           |                   |       +------------------+
           |                   |       | StandaloneMmCpu  |
           |                   |       +------------------+
           |                   |                |
           |                   |                |
           |                   |                |
   +----------------------+    |       +----------------------------+
   |  tpm_crb_ffa driver  |<---------->| StandaloneMmCoreEntryPoint |
   +----------------------+    .       |      (Misc Service)        |
                               .       +----------------------------+
                               .
                 Communicate via CRB over FF-A [0]
   

When a TPM command is initiated by Tpm2InstanceFfaLib or
tpm_crb_ffa driver according to
[the TPM Service Command Response Buffer Interface over FF-A][2] specitication,
FtpmDxe receives the command request and it calls the TpmLib which
is wrapper library of [The TPM 2.0 Reference Implementation Library][1]
to handle the command properly.

After TpmLib handles the TPM command via
[The TPM 2.0 Reference Implementation Library][1].
It delivers the result according to
[the TPM Service Command Response Buffer Interface over FF-A][2] specitication.

References

[1] https://github.com/TrustedComputingGroup/TPM
[2] https://developer.arm.com/documentation/den0138/latest/