Merge sandy/ivybridge romstage flow for MRC and non-MRC.

Change-Id: I11e09804ed1d8a7ae8b8d4502bd18f6be933f9fa
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: https://review.coreboot.org/13656
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/apple/macbookair4_2/early_southbridge.c b/src/mainboard/apple/macbookair4_2/early_southbridge.c
index 67f89db..e2a785c 100644
--- a/src/mainboard/apple/macbookair4_2/early_southbridge.c
+++ b/src/mainboard/apple/macbookair4_2/early_southbridge.c
@@ -55,6 +55,10 @@
 void mainboard_early_init(int s3resume) {
 }
 
+void mainboard_config_superio(void)
+{
+}
+
 void mainboard_get_spd(spd_raw_data *spd)
 {
 	void *spd_file;