Revert "Revert "samsung: doze: Add back button to action bar""

As of commit 8cd28f3bce5612d35c4b6196554c7e2846057310,
this app no longer lives on the Settings dashboard.

This reverts commit a75b016e61ef544abdadf4c5e7a508c04b18c8dc.

Change-Id: If5b1fa89ddcc9de3c93217ef79189ad9ebd5193d
1 file changed