arm64: dts: Add pin controller node for Spreadtrum SC9860

This patch adds the pin controller device node for Spreadtrum
SC9860 platform.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/boot/dts/sprd/whale2.dtsi

@@ -129,6 +129,11 @@ hwlock: hwspinlock@40500000 {
 				clock-names = "enable";
 				clocks = <&aon_gate CLK_SPLK_EB>;
 			};
+
+			pin_controller: pinctrl@402a0000 {
+				compatible = "sprd,sc9860-pinctrl";
+				reg = <0 0x402a0000 0 0x10000>;
+			};
 		};
 	};