nb/intel/sandybridge: Rename raminit_ivy.c

It is no longer specific to Ivy Bridge.

Change-Id: I3684e654a1b1aee308e30db739d41cf18e7ea6bd
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39790
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/sandybridge/Makefile.inc

@@ -23,7 +23,7 @@ ifeq ($(CONFIG_USE_NATIVE_RAMINIT),y)
 romstage-y += early_dmi.c
 romstage-y += raminit.c
 romstage-y += raminit_common.c
-romstage-y += raminit_ivy.c
+romstage-y += raminit_native.c
 romstage-y += raminit_tables.c
 romstage-y += ../../../device/dram/ddr3.c
 else