ARM: dts: ls1021a: removed compatible string "snps,dw-pcie"

Removed the wrong compatible string "snps,dw-pcie", in case
match incorrect driver.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -716,7 +716,7 @@ usb3: usb3@3100000 {
 		};
 
 		pcie@3400000 {
-			compatible = "fsl,ls1021a-pcie", "snps,dw-pcie";
+			compatible = "fsl,ls1021a-pcie";
 			reg = <0x00 0x03400000 0x0 0x00010000   /* controller registers */
 			       0x40 0x00000000 0x0 0x00002000>; /* configuration space */
 			reg-names = "regs", "config";
@@ -740,7 +740,7 @@ pcie@3400000 {
 		};
 
 		pcie@3500000 {
-			compatible = "fsl,ls1021a-pcie", "snps,dw-pcie";
+			compatible = "fsl,ls1021a-pcie";
 			reg = <0x00 0x03500000 0x0 0x00010000   /* controller registers */
 			       0x48 0x00000000 0x0 0x00002000>; /* configuration space */
 			reg-names = "regs", "config";