I suspect the only reason this was set was to avoid touching
the display related registers on arcturus.  Someone should
double check this on arcturus with S3.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>