soc/amd/turin_poc: Add SPI TPM SoC-specific initialization

Add the SoC hook to initialize SPI TPM decoding. Without the additional
programming an attempt to talk to SPI TPM hangs the platform when the
TPM_MEASURED_BOOT_INIT_BOOTBLOCK is set. If TPM is initialized in
ramstage, the OpenSIL programs the SPI TPM decoding properly and the
issue is not observed.

TEST=Select TPM_MEASURED_BOOT_INIT_BOOTBLOCK and enable
TPM_MEASURED_BOOT on Gigabyte MZ33-AR1, and observe the platform does
not hang in bootblock.

Change-Id: I2e6c0aad31fd0335e0d16111ed4894a12d2ba497
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89192
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>

src/soc/amd/turin_poc/Makefile.mk

@@ -8,6 +8,9 @@ all-y		+= i2c.c
 all-y		+= i3c.c
 all-y		+= uart.c
 
+all-y		+= lpc.c
+smm-y		+= lpc.c
+
 bootblock-y	+= early_fch.c
 bootblock-y	+= aoac.c
 

src/soc/amd/turin_poc/lpc.c

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/lpc.h>
+#include <device/pci.h>
+#include <soc/pci_devs.h>
+
+void soc_lpc_tpm_decode_spi(void)
+{
+	/* SoC-specific SPI TPM setting */
+	pci_or_config32(SOC_LPC_DEV, 0xdc, 1);
+}