soc/amd/common: Move lpc_util to verstage_x86

The file seems to be all about PCI configuration access.

Change-Id: I1e64d3d7df3caa33ee92961fe7246d03f2707ab4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43328
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -3,7 +3,7 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_LPC),y)
 ramstage-y += lpc.c
 
 bootblock-y += lpc_util.c
-verstage-y += lpc_util.c
+verstage_x86-y += lpc_util.c
 romstage-y += lpc_util.c
 postcar-y += lpc_util.c
 ramstage-y += lpc_util.c