drm/amdgpu: make normalize reg addr to common func for soc v1

drm/amdgpu: make normalize reg addr to common func for soc v1

Normalize registers address to local xcc address for sdma v7_1.
Merge normalize register address function to an common function
for soc v1.

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