Unlike mmhub v3_0_0, there is no atc_l2 related
registers available in mmhub v3_0_2. Split the mmhub
v3_0_2 callback implementations from mmhub v3_0 so we
don't need to add ip version check when atc related
programming needs to be added to mmhub v3_0_0.
Signed-off-by: NHawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: NLikun Gao <Likun.Gao@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>