arm64: dts: rockchip: fix cts, rts pin assign of UART3 for rk3399

This patch fixes pin assign of cts and rts signal of UART3.

Currently GPIO3_C2 and C3 pins are assigned but TRM says that
GPIO3_C0 and C1 are correct.

Refer:
  RK3399 TRM v1.4 - Table 19-1 UART Interface Description
Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -2543,12 +2543,12 @@ uart3_xfer: uart3-xfer {
 
 			uart3_cts: uart3-cts {
 				rockchip,pins =
-					<3 RK_PC2 2 &pcfg_pull_none>;
+					<3 RK_PC0 2 &pcfg_pull_none>;
 			};
 
 			uart3_rts: uart3-rts {
 				rockchip,pins =
-					<3 RK_PC3 2 &pcfg_pull_none>;
+					<3 RK_PC1 2 &pcfg_pull_none>;
 			};
 		};