Patch merged into coreboot/master: northbridge/amd/amdfam10: Add ability to set maximum P-state limit

the following patch was just integrated into master:
commit 010d62311ec4be4a61dc9ee394da39d908f1f7a8
Author: Timothy Pearson 
Date:   Wed Jun 10 00:35:05 2015 -0500

northbridge/amd/amdfam10: Add ability to set maximum P-state limit

Under specific circumstances, for instance in low power or fanless
    machines, it may be useful to cap the maximum P-state of the CPU.

Allow the maximum CPU P-state to be set via an NVRAM option.

Change-Id: Ifdbb1ad11a856f855c59702ae0ee99e95b08520e
    Signed-off-by: Timothy Pearson 
    Reviewed-on: http://review.coreboot.org/11985
    Reviewed-by: Patrick Georgi 
    Tested-by: build bot (Jenkins)

See http://review.coreboot.org/11985 for details.

-gerrit