Fix to hide the Satellite SOS system notification during satelltie overlay mode.

Stops the user from being able to see the silent notification and
disable the overlay mode.

Bug: 349195999
Test: manually testing the notificaiton being visible in the
notifications.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c57550c9a526573aae4ffdf9b0c6903caf4ad18d)
Merged-In: I685ce43d605195769d2f0cc1cd8ab7124b7d0928
Change-Id: I685ce43d605195769d2f0cc1cd8ab7124b7d0928