arm64: dts: rockchip: move uart2 pinmux to dtsi on rk3588-tiger

The association of uart2 to the q7-uart pins is part of the module
itself and not the baseboard used. Therefore move the pinctrl over
to the tiger dtsi.
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240422143356.2596414-1-heiko@sntech.deSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts

@@ -231,7 +231,6 @@ &u2phy3_host {
 };
 
 &uart2 {
-	pinctrl-0 = <&uart2m2_xfer>;
 	status = "okay";
 };
 

arch/arm64/boot/dts/rockchip/rk3588-tiger.dtsi

@@ -688,6 +688,11 @@ &tsadc {
 	status = "okay";
 };
 
+/* Routed to UART0 on the Q7 connector */
+&uart2 {
+	pinctrl-0 = <&uart2m2_xfer>;
+};
+
 /* Mule-ATtiny UPDI */
 &uart4 {
 	pinctrl-0 = <&uart4m2_xfer>;