[why]
update header files, and remove not used register access marco
Reviewed-by: NHansen Dsouza <hansen.dsouza@amd.com>
Acked-by: NPavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: NCharlene Liu <Charlene.Liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>