mainboard/intel/quark: Enable reg_access during romstage

Turn on reg_access during romstage.

TEST=Build and run on Galileo Gen2

Change-Id: Iff1616836d6031f43d7741693febefa0bf26b948
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15008
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/intel/galileo/Makefile.inc b/src/mainboard/intel/galileo/Makefile.inc
index 72c74e1..83fb0db 100644
--- a/src/mainboard/intel/galileo/Makefile.inc
+++ b/src/mainboard/intel/galileo/Makefile.inc
@@ -18,6 +18,7 @@
 endif
 
 romstage-y += gpio.c
+romstage-y += reg_access.c
 
 ramstage-y += gpio.c
 ramstage-y += reg_access.c