Calendar: post notifications permission

so the package can send notifications on T+

Bug: 194833441
Change-Id: I2d412d8949ce66e17b7f7110bbe6101aabaa3a41
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 686be7a..fed61b0 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -38,6 +38,7 @@
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="com.google.android.googleapps.permission.GOOGLE_AUTH.mail" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="30"></uses-sdk>