Revert "Hide the call strength icons from the statusbar"

This reverts commit 6edb46b4c0eea8a91d65a70eb9d19b6ff4526867.

Reason for revert: 
https://buganizer.corp.google.com/issues/185802587

Change-Id: I9c59a83fa19233b3a444bf4e425f562aed949efc
9 files changed