dmaengine: zynqmp_dma: Add device_synchronize support

dmaengine: zynqmp_dma: Add device_synchronize support

dmaengine_synchronize implementation is required to synchronize proper
termination of current transfers so that any memory resources are not freed
while still in use.

Implement this callback in the driver so that framework can use the same
(in dmaengine_terminate_sync/ dmaengine_synchronize).

Signed-off-by: Swati Agarwal <swati.agarwal@amd.com>
Link: https://lore.kernel.org/r/20220915090516.5812-1-swati.agarwal@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>