redhat/configs: enable CONFIG_I2C_MUX_PCA954x on x86

JIRA: https://issues.redhat.com/browse/RHEL-104973
Upstream Status: RHEL-only

CONFIG_I2C_MUX_PCA954x is currently enabled only on aarch64.
An Intel GNR-D platform uses this I2C multiplexer device.
Enable the config option also on x86, for both Fedora and RHEL.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>

Author: ivecera

redhat/configs/common/generic/x86/CONFIG_I2C_MUX_PCA954x

@@ -0,0 +1 @@
+CONFIG_I2C_MUX_PCA954x=m