Add change_overlay permission to systemui

SystemUI needs to be able to enable and disable
overlays in order to invert text and surface colors.

Bug: 38164700
Test: make
Change-Id: I7685d5fddb5a476e10012dab2d6e7ee5da206f80
diff --git a/data/etc/privapp-permissions-platform.xml b/data/etc/privapp-permissions-platform.xml
index 9000732..9cd2511 100644
--- a/data/etc/privapp-permissions-platform.xml
+++ b/data/etc/privapp-permissions-platform.xml
@@ -314,6 +314,7 @@
         <permission name="android.permission.BLUETOOTH_PRIVILEGED"/>
         <permission name="android.permission.CHANGE_COMPONENT_ENABLED_STATE"/>
         <permission name="android.permission.CHANGE_DEVICE_IDLE_TEMP_WHITELIST"/>
+        <permission name="android.permission.CHANGE_OVERLAY_PACKAGES"/>
         <permission name="android.permission.CONNECTIVITY_INTERNAL"/>
         <permission name="android.permission.CONTROL_VPN"/>
         <permission name="android.permission.DUMP"/>