asus/{p2b-x,p3b-f},intel/i440bx: Move mainboard_romstage_entry()

Change-Id: I3598f548c2d122906fda09c85b5a1c82b0da993b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38255
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/i440bx/raminit.h b/src/northbridge/intel/i440bx/raminit.h
index 347c1fe..1e9f25b 100644
--- a/src/northbridge/intel/i440bx/raminit.h
+++ b/src/northbridge/intel/i440bx/raminit.h
@@ -22,13 +22,8 @@
 
 void enable_spd(void);
 void disable_spd(void);
-
-/* Function prototypes. */
-void sdram_set_registers(void);
-void sdram_set_spd_registers(void);
-void sdram_enable(void);
-/* A merger of above functions */
 void sdram_initialize(void);
+void mainboard_enable_serial(void);
 
 /* Debug */
 #if CONFIG(DEBUG_RAM_SETUP)