440BX boards: Use combined RAM init routine

Change all 440BX boards to use the combined RAM init routine added in
commit 078e3240 (northbridge/intel/i440bx: Merge RAM init routines) [1].

[1] https://review.coreboot.org/20676

Change-Id: I699db882189f99018d4a6fdcb00f9438b2a7a1bc
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/20868
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/asus/p3b-f/romstage.c b/src/mainboard/asus/p3b-f/romstage.c
index bb16c78..0bb5bca 100644
--- a/src/mainboard/asus/p3b-f/romstage.c
+++ b/src/mainboard/asus/p3b-f/romstage.c
@@ -76,10 +76,7 @@
 
 	enable_spd();
 
-	dump_spd_registers();
-	sdram_set_registers();
-	sdram_set_spd_registers();
-	sdram_enable();
+	sdram_initialize();
 
 	disable_spd();
 }