drm/amdgpu: enable the ring and IB test for slave kcq

With the mec FW update to utilize the mqd base set by
driver for kcq mapping, slave kcq ring test and IB test
can be re-enabled.

Signed-off-by: Shiwu Zhang <shiwu.zhang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>