ARM: dts: rockchip: fix uart4 pin-numbers for rk3288

According to TRM, uart4 tx/rx should be 14/15
Signed-off-by: Jacob Chen <jacob-chen@iotwrt.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -1848,16 +1848,16 @@ uart3_rts: uart3-rts {
 
 		uart4 {
 			uart4_xfer: uart4-xfer {
-				rockchip,pins = <5 12 3 &pcfg_pull_up>,
-						<5 13 3 &pcfg_pull_none>;
+				rockchip,pins = <5 15 3 &pcfg_pull_up>,
+						<5 14 3 &pcfg_pull_none>;
 			};
 
 			uart4_cts: uart4-cts {
-				rockchip,pins = <5 14 3 &pcfg_pull_up>;
+				rockchip,pins = <5 12 3 &pcfg_pull_up>;
 			};
 
 			uart4_rts: uart4-rts {
-				rockchip,pins = <5 15 3 &pcfg_pull_none>;
+				rockchip,pins = <5 13 3 &pcfg_pull_none>;
 			};
 		};