nb/intel/sandybridge/raminit: Fix PDWN_mode on desktops

On desktop boards the PPD bit of MRS register MR0 is set and thus
DLL_Off mode shouldn't be used, as enforced by datasheet
2nd-gen-core-family-mobile-vol-2-datasheet chapter 2.17.1.

Change-Id: Ic42f2ff3e719636be67b00fa37155939cd2e17de
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/22260
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
2 files changed