dt-bindings: dmaengine: xilinx_dma:Add xlnx,axistream-connected property

Add an optional AXI DMA property 'xlnx,axistream-connected'. This
can be specified to indicate that DMA is connected to a streaming IP
in the hardware design and dma driver needs to do some additional
handling i.e pass metadata and perform streaming IP specific
configuration.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1691387509-2113129-2-git-send-email-radhey.shyam.pandey@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Radhey Shyam Pandey

Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt

@@ -49,6 +49,10 @@ Optional properties for AXI DMA and MCDMA:
 	register as configured in h/w. Takes values {8...26}. If the property
 	is missing or invalid then the default value 23 is used. This is the
 	maximum value that is supported by all IP versions.
+
+Optional properties for AXI DMA:
+- xlnx,axistream-connected: Tells whether DMA is connected to AXI stream IP.
+
 Optional properties for VDMA:
 - xlnx,flush-fsync: Tells which channel to Flush on Frame sync.
 	It takes following values: