VS-RK3399在android下面把声音放到最大时候，播放器自动退出问题
VS-RK3399 在android下面把声音放到最大时候，播放器自动退出问题。使用系统自带的Video.apk播放，当声音放到最大时候，播放视频过一会后自动退出，影响ADC采样，干扰了物理键，返回一个back键出来，刚好Video.apk有处理返回键的相应，导致播放时候退出。
修改方法：
\kernel\arch\arm64\boot\dts\rockchip\rk3399-android.dtsi
rk_key: rockchip-key {
                compatible = "rockchip,key";
                status = "okay";

                io-channels = <&saradc 1>;

                vol-up-key {
                        linux,code = <115>;
                        label = "volume up";
                        rockchip,adc_value = <1>;
                };

                vol-down-key {
                        linux,code = <114>;
                        label = "volume down";
                        rockchip,adc_value = <170>;
                };

                power-key {
                        gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
                        linux,code = <116>;
                        label = "power";
                        gpio-key,wakeup;
                };
#if 0
                menu-key {
                        linux,code = <59>;
                        label = "menu";
                        rockchip,adc_value = <746>;
                };

                home-key {
                        linux,code = <102>;
                        label = "home";
                        rockchip,adc_value = <355>;
                };

                back-key {
                        linux,code = <158>;
                        label = "back";
                        rockchip,adc_value = <560>;
                };

                camera-key {
                        linux,code = <212>;
                        label = "camera";
                        rockchip,adc_value = <450>;
                };
#endif

        };

按上面操作，把back键去掉