Remove "Avoid NPE during boot phase"

* Commit 8c4a19c8 fixed them all

Revert "WifiTile: Avoid NPE during boot phase"

This reverts commit 9f03a4ef.

Revert "DndTile: Avoid yet another NPE during boot up phase"

This reverts commit 8b802eec.

Revert "DndTile: Avoid NPE during boot phase"

This reverts commit 79ddcfba.

Revert "BluetoothTile: Avoid NPE during boot up phase"

This reverts commit 04cfb47d.

Change-Id: Id830df7c67682c7bba290ec89257f70f62bf4c81