drm/amdkfd: Shift sdma_engine_id and sdma_queue_id in mqd

FW of some new ASICs requires sdma mqd size to be not more than
128 dwords. Repurpose the last 2 reserved fields of sdma mqd for
driver internal use, so the total mqd size is no bigger than 128
dwords

Signed-off-by: Oak Zeng <ozeng@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amd: Put cik structures in a common place

This patch creates a new file, cik_structs.h, and puts the cik_mqd and
cik_sdma_rlc_registers structures in that file.

The new file is placed in a common include folder under the drm/amd folder, so
it will be shared among all amd drm drivers.

Signed-off-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>