drm/amdgpu: add sdma v4_4_0 ip headers (v2)

Add sdma v4_4_0 register offset and shift
masks in header files

v2: update registers (Alex)

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>