drm/amd/powerplay: delete SMUM_WRITE_FIELD

the macro is as same as PHM_WRITE_FIELD

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 files changed