PCI: pcie-brcmstb: fake MSIx support on internal MSI target

Apparently some NVMe SSD implementations don't fall back to MSI cleanly,
instead making the driver allocate one queue via the legacy interrupt.

There are still only 32 vectors available, but should be sufficient for
the majority of use-cases on BCM2711.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>

Author: P33M

drivers/pci/controller/pcie-brcmstb.c

@@ -667,7 +667,8 @@ static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
 				 MSI_FLAG_NO_AFFINITY)
 
 #define BRCM_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK	| \
-				  MSI_FLAG_MULTI_PCI_MSI)
+				  MSI_FLAG_MULTI_PCI_MSI	| \
+				  MSI_FLAG_PCI_MSIX)
 
 static const struct msi_parent_ops brcm_msi_parent_ops = {
 	.required_flags		= BRCM_MSI_FLAGS_REQUIRED,