The ROMC_INDEX/DATA offset was changed to e4/e5 since
from smuio_v11 (vega20/arcturus).
Signed-off-by: NHawking Zhang <Hawking.Zhang@amd.com>
Tested-by: NCandice Li <Candice.Li@amd.com>
Reviewed-by: NCandice Li <Candice.Li@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>