drm/amdgpu: Add athub v4_1_0 ip headers (v5)

v1: Add athub v4_1_0 register offset and shift masks
header files. (Hawking)
v2: Update athub v4_1_0 register offset and shift masks
header files to RE2. (Likun)
v3: Update athub v4_1_0 register offset and shift masks
header files to RE2.5 (Likun)
v4: Update athub v4_1_0 register offset and shift masks
header files to RE3. (Likun)
v5: Clean up athub v4_1_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>