boards: arm: mps2: Add LED & Buttons to board dts

Update board dts files to add User LED and Button support.  Also update
the board yaml file to say the boards support gpio.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

boards/arm/mps2_an385/mps2_an385.dts

@@ -10,6 +10,13 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	aliases {
+		led0 = &led_0;
+		led1 = &led_1;
+		sw0 = &user_button_0;
+		sw1 = &user_button_1;
+	};
+
 	chosen {
 		zephyr,console = &uart0;
 		zephyr,shell-uart = &uart0;
@@ -18,6 +25,30 @@
 		zephyr,flash = &flash0;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		led_0: led_0 {
+			gpios = <&gpio_led0 0>;
+			label = "USERLED0";
+		};
+		led_1: led_1 {
+			gpios = <&gpio_led0 1>;
+			label = "USERLED1";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button_0: button_0 {
+			label = "USERPB0";
+			gpios = <&gpio_button 0>;
+		};
+		user_button_1: button_1 {
+			label = "USERPB1";
+			gpios = <&gpio_button 1>;
+		};
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

boards/arm/mps2_an385/mps2_an385.yaml

@@ -10,5 +10,6 @@ toolchain:
 supported:
   - counter
   - netif:serial-net
+  - gpio
 testing:
   default: true

boards/arm/mps2_an521/mps2_an521.dts

@@ -14,6 +14,13 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	aliases {
+		led0 = &led_0;
+		led1 = &led_1;
+		sw0 = &user_button_0;
+		sw1 = &user_button_1;
+	};
+
 	chosen {
 		zephyr,console = &uart0;
 		zephyr,shell-uart = &uart0;
@@ -21,6 +28,30 @@
 		zephyr,flash = &flash0;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		led_0: led_0 {
+			gpios = <&gpio_led0 0>;
+			label = "USERLED0";
+		};
+		led_1: led_1 {
+			gpios = <&gpio_led0 1>;
+			label = "USERLED1";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button_0: button_0 {
+			label = "USERPB0";
+			gpios = <&gpio_button 0>;
+		};
+		user_button_1: button_1 {
+			label = "USERPB1";
+			gpios = <&gpio_button 1>;
+		};
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

boards/arm/mps2_an521/mps2_an521.yaml

@@ -7,3 +7,5 @@ toolchain:
   - gnuarmemb
   - zephyr
   - xtools
+supported:
+  - gpio

boards/arm/mps2_an521/mps2_an521_nonsecure.dts

@@ -14,6 +14,13 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	aliases {
+		led0 = &led_0;
+		led1 = &led_1;
+		sw0 = &user_button_0;
+		sw1 = &user_button_1;
+	};
+
 	chosen {
 		zephyr,console = &uart0;
 		zephyr,shell-uart = &uart0;
@@ -21,6 +28,30 @@
 		zephyr,flash = &flash0;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		led_0: led_0 {
+			gpios = <&gpio_led0 0>;
+			label = "USERLED0";
+		};
+		led_1: led_1 {
+			gpios = <&gpio_led0 1>;
+			label = "USERLED1";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+		user_button_0: button_0 {
+			label = "USERPB0";
+			gpios = <&gpio_button 0>;
+		};
+		user_button_1: button_1 {
+			label = "USERPB1";
+			gpios = <&gpio_button 1>;
+		};
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

boards/arm/mps2_an521/mps2_an521_nonsecure.yaml

@@ -6,3 +6,5 @@ toolchain:
   - gnuarmemb
   - zephyr
   - xtools
+supported:
+  - gpio