drm/amdgpu: add gfx12 mqd structures

memory queue descriptors for gfx12.

v2: squash in sdma updates (Alex)

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>