Fulfill Navi gfx and pcie settings on umd pstate switching.

V2: temporarily skip the pcie ASPM setting considering the ASPM function
    is not fully enabled yet
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>