drm/radeon: Enable sdma preemption
drm/radeon: Enable sdma preemption

This patch adds to radeon the enablement of sdma preemption.
This is needed to support HWS of SDMA user-mode queues.

Signed-off-by: Ben Goz <7ad054068e22862b74505c1139ad54a17792b0d9@amd.com>
Signed-off-by: Oded Gabbay <c2fce4493a16d94b58efb315151c29911fc5d347@amd.com>
Reviewed-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs