dt-bindings: fsl-qdma: Add LS1028A qDMA bindings

Add LS1028A qDMA controller bindings to fsl-qdma bindings.
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/dma/fsl-qdma.txt

@@ -7,6 +7,7 @@ Required properties:
 
 - compatible:		Must be one of
 			 "fsl,ls1021a-qdma": for LS1021A Board
+			 "fsl,ls1028a-qdma": for LS1028A Board
 			 "fsl,ls1043a-qdma": for ls1043A Board
 			 "fsl,ls1046a-qdma": for ls1046A Board
 - reg:			Should contain the register's base address and length.