drm/amdgpu: adjust some basic elements for multiple AID case

add some elements below:
 - num_aid
 - aid_id for each sdma instance
 - num_inst_per_aid for sdma

and extend macro size below:
 - SDMA_MAX_INSTANCES to 16
 - AMDGPU_MAX_RINGS to 96
 - AMDGPU_MAX_HWIP_RINGS to 32

v2: move aid_id from amdgpu_ring to amdgpu_sdma_instance. (Lijo)

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>