amdkfd: Add queue module

The queue module enables allocating and initializing queues uniformly.

v3: Removed typedef and redundant memset call. Broke long pr_debug print to one
liners and Added documentation.

v5: Move amdkfd from drm/radeon/ to drm/amd/

Signed-off-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>

diff --cc drivers/gpu/drm/amd/amdkfd/Makefile
Simple merge

diff --cc drivers/gpu/drm/amd/amdkfd/kfd_priv.h
Simple merge

diff --cc drivers/gpu/drm/amd/amdkfd/kfd_queue.c
Simple merge