Patch merged into coreboot/master: nb/intel/sandybridge/raminit: support calling dram_freq multiple times

the following patch was just integrated into master:
commit 9c9bde3aa35922cf680c91f9260dd7905cc8cb6b
Author: Patrick Rudolph 
Date:   Sat Mar 26 17:20:02 2016 +0100

nb/intel/sandybridge/raminit: support calling dram_freq multiple times

The PLL will never lock if the requested frequency is already set.
    As the fallback may request the same frequency again exit early
    to prevent a hang.

Test system:
     * Gigabyte GA-B75M-D3H
     * Intel Pentium CPU G2130

Change-Id: I625b2956346d8c50cca84def6190c076bf99dbec
    Signed-off-by: Patrick Rudolph 
    Reviewed-on: https://review.coreboot.org/14174
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/14174 for details.

-gerrit