drm/amd/soc15: Add external_rev_id for vega12.

Add external_rev_id for vega12.

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed