enable rk3568 model adc keys

configfiles/adc-key.txt

@@ -0,0 +1,15 @@
+	adc-keys {
+		compatible = "adc-keys";
+		io-channels = <&saradc 0>;
+		io-channel-names = "buttons";
+		keyup-threshold-microvolt = <1800000>;
+		u-boot,dm-spl;
+		status = "okay";
+
+		volumeup-key {
+			u-boot,dm-spl;
+			linux,code = <KEY_VOLUMEUP>;
+			label = "volume up";
+			press-threshold-microvolt = <9>;
+		};
+	};

diy-part2.sh

@@ -10,6 +10,9 @@
 # 删除引起iproute2依赖编译报错的补丁
 [ -e package/libs/elfutils/patches/999-fix-odd-build-oot-kmod-fail.patch ] && rm -f package/libs/elfutils/patches/999-fix-odd-build-oot-kmod-fail.patch
 
+# enable rk3568 model adc keys
+sed -i '/\/\ {/r $GITHUB_WORKSPACE/configfiles/adc-key.txt' package/boot/uboot-rk35xx/src/arch/arm/dts/rk3568-easepi.dts
+
 # update ubus git HEAD
 cp -f $GITHUB_WORKSPACE/configfiles/ubus_Makefile package/system/ubus/Makefile