amdgpu: Add VMID reservation per GPU context test.

The test will Reserve a VMID, submit a command and
unreserve the VMID.

v2:
Wrappers names were changed.

Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>