nyan: Add 4GB bct support

Replace sdram entry 1 with valid configurations since nyan 4GB board uses
RAM_CODE 1.

BUG=none
TEST=Flash and boot new image.bin. Console shows "RAMCODE=1" and
	"Total SDRAM (MB): 4096"
BRANCH=none

Original-Change-Id: Ia872bd7849f1b58075e1f97bf300e081293cb0d4
Original-Signed-off-by: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/187450
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
(cherry picked from commit f19e2ea3dd4d314b7540c7cf9a11d7af289d24d0)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I4914c3811b13c8cee0577101bc0c8ee32a0a5b81
Reviewed-on: http://review.coreboot.org/7406
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
3 files changed