ARM: dts: uniphier: Remove compatible "snps,dw-pcie-ep" from pcie-ep node

The generic platform driver pcie-designware-plat.c doesn't work for
UniPhier PCIe endpoint controller, because the controller has some
necessary initialization sequence for the controller-specific logic.

Currently the controller doesn't use "snps,dw-pcie-ep" compatible,
so this is no longer needed. Remove the compatible string from the
pcie-ep node.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042249.4708-10-hayashi.kunihiko@socionext.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/uniphier-pro5.dtsi

@@ -620,8 +620,7 @@ usb1_ssphy0: ss-phy@380 {
 		};
 
 		pcie_ep: pcie-ep@66000000 {
-			compatible = "socionext,uniphier-pro5-pcie-ep",
-				     "snps,dw-pcie-ep";
+			compatible = "socionext,uniphier-pro5-pcie-ep";
 			status = "disabled";
 			reg-names = "dbi", "dbi2", "link", "addr_space";
 			reg = <0x66000000 0x1000>, <0x66001000 0x1000>,