drm/amd/display: add S/G support for Vangogh

[Why]
Scatter/gather feature is supported on Vangogh.

[How]
Add GTT domain support for Vangogh to enable
display buffers in system memory.

Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Roman Li 2020-12-01 14:05:36 -05:00 • committed by Alex Deucher
commit 5cd5f00700