Raven support gfx off feature instand of gfx powergate,
so use smu10_gfx_off_control as the powergate_gfx backend function.
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>