Car System Updater: post notifications permission

so the package can send notifications on T+

Bug: 194833441
Change-Id: I4331cad8a345e4eadbe6c6c54ad4c214cf46203e
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 73d99bd..e19b269 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -24,6 +24,7 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.REBOOT" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-feature android:name="android.hardware.usb.host" />
 
     <application