soc/amd/genoa: add root complex support code

This functionality will eventually be used by the common data fabric
domain resource reporting code.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ieedd432c144e53e43d8099ec617a15056bb36fd1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78307
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/amd/genoa/Makefile.inc b/src/soc/amd/genoa/Makefile.inc
index ef8f349..2877fea 100644
--- a/src/soc/amd/genoa/Makefile.inc
+++ b/src/soc/amd/genoa/Makefile.inc
@@ -14,6 +14,7 @@
 
 ramstage-y	+= aoac.c
 ramstage-y	+= chip.c
+ramstage-y	+= root_complex.c
 
 CPPFLAGS_common += -I$(src)/soc/amd/genoa/include