dmaengine: xilinx: xdma: Add necessary macro definitions

Complete lacking bits describing the status/control register values.
Add macros describing the status/control registers.

Signed-off-by: Jan Kuliga <jankul@alatek.krakow.pl>
Link: https://lore.kernel.org/r/20231218113943.9099-3-jankul@alatek.krakow.pl


Signed-off-by: Vinod Koul <vkoul@kernel.org>