Add a PACKET_KEEPALIVE_OFFLOAD permission.

    <permission android:name="android.permission.CONNECTIVITY_INTERNAL"

        android:protectionLevel="signature|privileged" />

    <!-- Allows a system application to access hardware packet offload capabilities.

         @hide -->

    <permission android:name="android.permission.PACKET_KEEPALIVE_OFFLOAD"

        android:protectionLevel="signature|privileged" />

    <!-- @SystemApi

         @hide -->

    <permission android:name="android.permission.RECEIVE_DATA_ACTIVITY_CHANGE"