arm: dts: keystone: Correct DWC USB3 compatible string

Syonpsys IP cores are supposed to be defined with "snps" vendor-prefix.
Use it instead of the deprecated "synopsys" one.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>

arch/arm/boot/dts/keystone-k2e.dtsi

@@ -79,7 +79,7 @@ keystone_usb1: usb@25000000 {
 			status = "disabled";
 
 			usb1: dwc3@25010000 {
-				compatible = "synopsys,dwc3";
+				compatible = "snps,dwc3";
 				reg = <0x25010000 0x70000>;
 				interrupts = <GIC_SPI 414 IRQ_TYPE_EDGE_RISING>;
 				usb-phy = <&usb1_phy>, <&usb1_phy>;

arch/arm/boot/dts/keystone.dtsi

@@ -218,7 +218,7 @@ keystone_usb0: usb@2680000 {
 			status = "disabled";
 
 			usb0: dwc3@2690000 {
-				compatible = "synopsys,dwc3";
+				compatible = "snps,dwc3";
 				reg = <0x2690000 0x70000>;
 				interrupts = <GIC_SPI 393 IRQ_TYPE_EDGE_RISING>;
 				usb-phy = <&usb_phy>, <&usb_phy>;