ivy: Add a possiblity for mainboard early init.

This is needed for stout EC init.

Change-Id: I5c73499c17763229840152a473a2d820802ee2f6
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: https://review.coreboot.org/13535
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/northbridge/intel/sandybridge/romstage.c b/src/northbridge/intel/sandybridge/romstage.c
index 34d759f..3d05f8e 100644
--- a/src/northbridge/intel/sandybridge/romstage.c
+++ b/src/northbridge/intel/sandybridge/romstage.c
@@ -103,6 +103,9 @@
 	s3resume = southbridge_detect_s3_resume();
 
 	post_code(0x38);
+
+	mainboard_early_init(s3resume);
+
 	/* Enable SPD ROMs and DDR-III DRAM */
 	enable_smbus();