drm/amdgpu: Add lsdma v7_0_0 ip headers (v3)

v1: Add lsdma v7_0_0 register offset and shift masks
    header files (Hawking)
v2: Update lsdma v7_0_0 register offset and shift masks
    header files for RE2.5 (Likun)
v3: Clean up lsdma v7_0_0 ip headers (Alex)

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