[Catalyst] Implement get{Read,Write}Permissions for Battery percentage

NO_IFTTT=Catalyst only

Fix: 385288692
Flag: com.android.settings.flags.catalyst_power_usage_summary_screen
Test: devtool
Change-Id: I42ba759cac04ffc41787b0fca3e04f64584c57c9

src/com/android/settings/display/BatteryPercentageSwitchPreference.kt

@@ -49,9 +49,13 @@ class BatteryPercentageSwitchPreference :
                 com.android.internal.R.bool.config_battery_percentage_setting_available
             )
 
+    override fun getReadPermissions(context: Context) = SettingsSystemStore.getReadPermissions()
+
     override fun getReadPermit(context: Context, callingPid: Int, callingUid: Int) =
         ReadWritePermit.ALLOW
 
+    override fun getWritePermissions(context: Context) = SettingsSystemStore.getWritePermissions()
+
     override fun getWritePermit(
         context: Context,
         value: Boolean?,