drm/amd/display: Add Gfx Base Case For Linear Tiling Handling

drm/amd/display: Add Gfx Base Case For Linear Tiling Handling

[Why]
Post-driver cases always use linear tiling yet there is no dedicated
Gfx handling for this condition.

[How]
Add DcGfxBase/DalGfxBase to gfx version enums and set tiling to linear
when it is used. Also, enforce the use of proper tiling format as tiling
information is used.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Carbones <ncarbone@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>