Default STAPM percentage causes a lot of thermal throttling on grunt. AMD experimented with 80%, it works for grunt. This is initial code to provide easy change path for other grunt based platforms. BUG=b:111608748 TEST=build and boot grunt. Change-Id: I22863f6ed76152bf872fce3e275f8a7fd8077504 Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com> Reviewed-on: https://review.coreboot.org/28564 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com>