drm/amdkfd: Delete KFD_MQD_TYPE_COMPUTE

It is the same as KFD_MQD_TYPE_CP, so delete it. As a result, we will
have one less mqd mananger per device.

Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>