add:增加pm.DAC_EN

luat/include/luat_pm.h

@@ -15,6 +15,7 @@ enum
 	LUAT_PM_POWER_USB,
 	LUAT_PM_POWER_GPS,
 	LUAT_PM_POWER_GPS_ANT,
+	LUAT_PM_POWER_DAC_EN_PIN,
 };
 
 int luat_pm_request(int mode);

luat/modules/luat_lib_pm.c

@@ -298,7 +298,8 @@ static const rotable_Reg_t reg_pm[] =
     { "GPS",            ROREG_INT(LUAT_PM_POWER_GPS)},
     //@const GPS_ANT number GPS的天线电源，有源天线才需要
     { "GPS_ANT",        ROREG_INT(LUAT_PM_POWER_GPS_ANT)},
-
+    //@const DAC_EN number Air780E和Air600E的DAC_EN，注意audio的默认配置会自动使用这个脚来控制CODEC的使能
+    { "DAC_EN",        ROREG_INT(LUAT_PM_POWER_DAC_EN_PIN)},
 	{ NULL,             ROREG_INT(0) }
 };