dt-bindings: dmaengine: zynqmp_dma: add xlnx,bus-width required property

xlnx,bus-width is a required property. In yaml conversion somehow
it got missed out. Bring it back and mention it in required list.
Also add Harini and myself to the maintainer list.

Fixes: 5a04982df8da ("dt-bindings: dmaengine: zynqmp_dma: convert to yaml")
Signed-off-by: Radhey Shyam Pandey <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Michael Tretter <[e-mail]>
Reviewed-by: Peter Korsgaard <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/dma/xilinx/xlnx,zynqmp-dma-1.0.yaml

···
 
 maintainers:
   - Michael Tretter <[e-mail]>
+  - Harini Katakam <[e-mail]>
+  - Radhey Shyam Pandey <[e-mail]>
 
 allOf:
   - $ref: ../dma-controller.yaml#
···
   - interrupts
   - clocks
   - clock-names
+  - xlnx,bus-width
 
 additionalProperties: false