[Why] Auto Overclock Memory fails for some systems that don't support
p-state.

[How] Implement the workaround, and it's corresponding enable flag.
Signed-off-by: NJaehyun Chung <jaehyun.chung@amd.com>
Reviewed-by: NAlvin Lee <Alvin.Lee2@amd.com>
Acked-by: NLeo Li <sunpeng.li@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>