src/amd/common: Exclude biosram from psp_verstage

This isn't needed for psp_verstage, and causes build failures if
included.

BUG=b:158124527
TEST=Build & boot Trembyle with psp_verstage

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I63942ad896d205c327d65bb8083da817b972962b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42808
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/amd/common/block/acpimmio/Makefile.inc b/src/soc/amd/common/block/acpimmio/Makefile.inc
index 69253b9..553d9e2 100644
--- a/src/soc/amd/common/block/acpimmio/Makefile.inc
+++ b/src/soc/amd/common/block/acpimmio/Makefile.inc
@@ -6,7 +6,7 @@
 smm-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += mmio_util.c
 
 bootblock-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c
-verstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c
+verstage_x86-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c
 romstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c
 postcar-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c
 ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_ACPIMMIO) += biosram.c