move en/disable GFX CP/SMU_HS PG to
function gfx_v8_0_set_powergating_state
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>