drm/amdgpu: add full TMZ support into amdgpu_ttm_map_buffer v2

This should allow us to also support VRAM->GTT moves.

v2: fix missing vram_base_adjustment

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Tested-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>