mainboard/google/meowth: Enable System Agent dynamic frequency

Enable System Agent dynamic frequency support by default.

BUG=None
TEST=Build and flash with debug version FSP, check SaGv in serial print
to be set to "4".

Change-Id: I7dd29db206b06e600407bb0b1d0bc7530f4ac93e
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/25093
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed