Documentation: fsl-quadspi: Add fsl,ls1043a-qspi compatible string

new compatible string: "fsl,ls1043a-qspi".
Signed-off-by: Yuan Yao <yao.yuan@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/mtd/fsl-quadspi.txt

@@ -5,7 +5,8 @@ Required properties:
 		 "fsl,imx7d-qspi", "fsl,imx6ul-qspi",
 		 "fsl,ls1021a-qspi"
 		 or
-		 "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi"
+		 "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi",
+		 "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi"
   - reg : the first contains the register location and length,
           the second contains the memory mapping address and length
   - reg-names: Should contain the reg names "QuadSPI" and "QuadSPI-memory"