drm/amdgpu: program GRBM_MCM_ADDR for non-AID0 GRBM

Otherwise the EOP interrupt on non-AID0 cannot route to IH0.

Signed-off-by: Le Ma <le.ma@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>