nb/intel/sandybridge: Move IOSAV functions to separate file

Change-Id: Icbe01ec98995c3aea97bb0f4f84a938b26896fab
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47491
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/northbridge/intel/sandybridge/Makefile.inc b/src/northbridge/intel/sandybridge/Makefile.inc
index a5b2e5e..6380681 100644
--- a/src/northbridge/intel/sandybridge/Makefile.inc
+++ b/src/northbridge/intel/sandybridge/Makefile.inc
@@ -22,6 +22,7 @@
 romstage-y += early_dmi.c
 romstage-y += raminit.c
 romstage-y += raminit_common.c
+romstage-y += raminit_iosav.c
 romstage-y += raminit_native.c
 romstage-y += raminit_tables.c
 romstage-y += ../../../device/dram/ddr3.c