[1/2] Settings: Add unlock icons for Gmail and Snapchat
Based on this commit:
https://github.com/omnirom/android_packages_apps_OmniGears/commit/0511ec2973ccfd08ec3e6f9298f37f9ffbb29b9b

Change-Id: I9c4e2076a21f7fe5f962faff21fdacb98c6711b5