drm/amd/pm: keep the BACO feature enabled for suspend

commit eaa09053 upstream.

To pair with the workaround which always reset the ASIC in suspend.
Otherwise, the reset which relies on BACO will fail.

Fixes: daf8de08 ("drm/amdgpu: always reset the asic in suspend (v2)")

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>