mb/intel/dcp847ske: Drop useless MCHBAR writes

There's no need to write the GDCRTRAININGRESULT registers after raminit.

Change-Id: If604920fe7a3bee96f72f8aff5e96f0e25548f18
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50534
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/dcp847ske/early_southbridge.c

@@ -9,14 +9,6 @@
 #include "superio.h"
 #include "thermal.h"
 
-void mainboard_late_rcba_config(void)
-{
-	/* Set "mobile" bit in MCH (which makes sense layout-wise). */
-	/* Note sure if this has any effect at all though. */
-	MCHBAR32(0x0004) |= 0x00001000;
-	MCHBAR32(0x0104) |= 0x00001000;
-}
-
 static const u16 hwm_initvals[] = {
 	HWM_BANK(0),
 	HWM_INITVAL(0xae, 0x01), /* Enable PECI Agent0 */