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[Why&How] Check DCCG_AUDIO_DTO2 register mask exist before access. Also, add a existing DIO_CLOCK_control register for later use. Reviewed-by: Roman Li <roman.li@amd.com> Signed-off-by: Charlene Liu <Charlene.Liu@amd.com> Signed-off-by: Ivan Lipski <ivan.lipski@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>