soc/amd/common: add comments and FIXME to Makefile.inc files

Change-Id: Ie347ee508acd900353467b4a3e0a5d1928b110e1
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47877
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/pci/Makefile.inc

@@ -1,6 +1,6 @@
-
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_PCI) += amd_pci_util.c
 
+# FIXME: This gets added when CONFIG_SOC_AMD_COMMON is set, which is a bit unexpected.
 bootblock-y += amd_pci_mmconf.c
 verstage_x86-y += amd_pci_mmconf.c
 romstage-y += amd_pci_mmconf.c

src/soc/amd/common/block/pi/Makefile.inc

@@ -14,4 +14,4 @@ ramstage-y += heapmanager.c
 ramstage-y += image.c
 ramstage-y += refcode_loader.c
 
-endif
+endif # CONFIG_SOC_AMD_COMMON_BLOCK_PI

src/soc/amd/common/block/s3/Makefile.inc

@@ -3,4 +3,4 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_S3),y)
 romstage-y += s3_resume.c
 ramstage-y += s3_resume.c
 
-endif
+endif # CONFIG_SOC_AMD_COMMON_BLOCK_S3

src/soc/amd/common/block/smbus/Makefile.inc

@@ -4,4 +4,4 @@ romstage-y += smbus.c
 ramstage-y += smbus.c
 ramstage-y += sm.c
 
-endif
+endif # CONFIG_SOC_AMD_COMMON_BLOCK_SMBUS