Move the common code to amdgpu_smu.c instead of having one
copy in both smu_v11_0.c and smu_v12_0.c.
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>