drm/amdgpu: set asic family and ip blocks for vega12

soc15 just like vega10 and raven.

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