nb/intel/i440bx, mb/asus/p3b-f: Abolish disable_spd()

This hook is specifically for asus/p3b-f so its mainboard code has
a chance to put SPD away after RAM init completes. What it intends
to do is done when GPO gets programmed in ramstage (and it's safe
to do so), and no other board needs this hook, so drop it.

Change-Id: Ib7874b4d2b69fdaa5f3c5a3421a62a629c4154a4
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73951
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/asus/p2b/variants/p3b-f/romstage.c

@@ -25,12 +25,3 @@ void enable_spd(void)
 {
 	outb(0x6f, PM_IO_BASE + 0x37);
 }
-
-/*
- * Disable SPD access after RAM init to allow access to SMBus/I2C offsets
- * 0x48/0x49/0x2d, which is required e.g. by lm-sensors.
- */
-void disable_spd(void)
-{
-	outb(0x67, PM_IO_BASE + 0x37);
-}

src/northbridge/intel/i440bx/raminit.c

@@ -1001,7 +1001,6 @@ static void sdram_enable(void)
 
 /* Implemented under mainboard. */
 void __weak enable_spd(void) { }
-void __weak disable_spd(void) { }
 
 void sdram_initialize(int s3resume)
 {
@@ -1013,6 +1012,5 @@ void sdram_initialize(int s3resume)
 	sdram_set_spd_registers();
 	sdram_enable();
 
-	disable_spd();
 	timestamp_add_now(TS_INITRAM_END);
 }

src/northbridge/intel/i440bx/raminit.h

@@ -13,7 +13,6 @@
 #define DIMM3		0x53
 
 void enable_spd(void);
-void disable_spd(void);
 void sdram_initialize(int s3resume);
 
 /* Debug */