ath79: add pinmux to ar9330

This patch adds the pinmux support to the ar9330 used to disable the
JTAG or to enable switch LEDs

Signed-off-by: Rocco Folino <rocco@folino.io>

target/linux/ath79/dts/ar9330.dtsi

@@ -61,6 +61,24 @@
 				status = "disabled";
 			};
 
+			pinmux: pinmux@18040028 {
+				compatible = "pinctrl-single";
+				reg = <0x18040028 0x8>;
+
+				pinctrl-single,bit-per-mux;
+				pinctrl-single,register-width = <32>;
+				pinctrl-single,function-mask = <0x1>;
+				#pinctrl-cells = <2>;
+
+				jtag_disable_pins: pinmux_jtag_disable_pins {
+					pinctrl-single,bits = <0x0 0x1 0x1>;
+				};
+
+				switch_led_pins: pinmux_switch_led_pins {
+					pinctrl-single,bits = <0x0 0x1f 0xf8>;
+				};
+			};
+
 			pll: pll-controller@18050000 {
 				compatible = "qca,ar9330-pll";
 				reg = <0x18050000 0x100>;