soc/amd/common: Add Kconfig/Makefile support for common/fsp/*

This will allow us to have subdirectories in common/fsp.

BUG=b:184766519
TEST=Build guybrush

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ib3497791e1963867c8fe06a42c111e5d0503ade1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52910
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/common/Kconfig.common

@@ -10,4 +10,10 @@ config SOC_AMD_PI
 
 source "src/soc/amd/common/block/*/Kconfig"
 
+if PLATFORM_USES_FSP2_0
+
+source "src/soc/amd/common/fsp/*/Kconfig"
+
+endif # PLATFORM_USES_FSP2_0
+
 endif # SOC_AMD_COMMON

src/soc/amd/common/fsp/Makefile.inc

@@ -2,4 +2,7 @@ ifeq ($(CONFIG_PLATFORM_USES_FSP2_0),y)
 romstage-y += fsp_reset.c
 ramstage-y += fsp_reset.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += fsp-acpi.c
+
+subdirs-y += ./*
+
 endif # CONFIG_PLATFORM_USES_FSP2_0