Make CHANGE_APP_IDLE_STATE a system API

Allows a privileged app to set standby bucket states for apps.

Bug: 63527785
Test: adb shell am set-standby-bucket com.example.foo 0
Change-Id: I613f8872ae816e39b167aad1c289187362aa6094
diff --git a/data/etc/privapp-permissions-platform.xml b/data/etc/privapp-permissions-platform.xml
index 2f9ae57..82aa803 100644
--- a/data/etc/privapp-permissions-platform.xml
+++ b/data/etc/privapp-permissions-platform.xml
@@ -232,6 +232,7 @@
         <permission name="android.permission.BACKUP"/>
         <permission name="android.permission.BATTERY_STATS"/>
         <permission name="android.permission.BLUETOOTH_PRIVILEGED"/>
+        <permission name="android.permission.CHANGE_APP_IDLE_STATE"/>
         <permission name="android.permission.CHANGE_CONFIGURATION"/>
         <permission name="android.permission.DELETE_PACKAGES"/>
         <permission name="android.permission.FORCE_STOP_PACKAGES"/>
@@ -266,6 +267,7 @@
         <permission name="android.permission.BACKUP"/>
         <permission name="android.permission.BATTERY_STATS"/>
         <permission name="android.permission.BIND_APPWIDGET"/>
+        <permission name="android.permission.CHANGE_APP_IDLE_STATE"/>
         <permission name="android.permission.CHANGE_COMPONENT_ENABLED_STATE"/>
         <permission name="android.permission.CHANGE_CONFIGURATION"/>
         <permission name="android.permission.CHANGE_DEVICE_IDLE_TEMP_WHITELIST" />