riscv: dts: k1: add pinctrl property in dts.

Add pinctrl node in device tree and update
in bananapi f3 dts.

Signed-off-by: Huan Zhou <me@per1cycle.org>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/dts/k1-bananapi-f3.dts b/arch/riscv/dts/k1-bananapi-f3.dts
index d2486f7..6b5b83b 100644
--- a/arch/riscv/dts/k1-bananapi-f3.dts
+++ b/arch/riscv/dts/k1-bananapi-f3.dts
@@ -5,6 +5,7 @@
 
 #include "k1.dtsi"
 #include "binman.dtsi"
+#include "k1-pinctrl.dtsi"
 
 / {
 	model = "Banana Pi BPI-F3";
@@ -21,5 +22,7 @@
 };
 
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_2_cfg>;
 	status = "okay";
 };