drm/amd/amdgpu: Increase max rings to enable SDMA page ring

Increase the maximum number of rings supported by the AMDGPU driver from 133 to 149.
This change is necessary to enable support for the SDMA page ring.

Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>