drm/amdgpu: add asic callback for BACO support

BACO - Bus Active, Chip Off

Used to check whether the device supports BACO.  This will
be used to enable runtime pm on devices which support BACO.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2019-10-04 10:01:35 -05:00
commit 69d5436d4d