RK系列（RK3568） GPIO按键驱动 和Android key新值添加

平台：Android12

SOC：RK3568

kernel:Linux-4.19

首先按键驱动那块不用我们自己写，内核本身有支持可以查看kernel-4.19-driver/input/keyboard/gpio_keys.c

我们先描述好设备树

添加GPIO4-A0的按键 

gpio-keys {
		compatible = "gpio-keys";
		#address-cells = <1>;
		#size-cells = <0>;
		autorepeat;

		pinctrl-names = "default";
		pinctrl-0 = <&zy_key_pin>;

		zy_key: zy-key {
			label = "GPIO Key zy_key";
			gpios = <&gpio4 RK_PA0 GPIO_ACTIVE_LOW>;
			linux,code = ;
		};
	};

&pinctrl {
    keys {
		zy_key_pin: pwr-key-pin {
			rockchip,pins = <4 RK_PA0 RK_FUNC_GPIO &pcfg_pull_none>;
		};
};

添加linux