Launcher3 : checkItemPlacement fixes

This patchset addresses two bugs :

1) Incorrect casting of key causes mismatches
2) On hotseat items 2 and above, the occupied hashmap is populated
with the CONTAINER_HOTSEAT key, however if its a new item and its required
cell is not already been taken, the code falls through to the workspace checks.
Make sure hotseat items are treated separately.

Change-Id: I3f22e46940f62a223453bd05314eae2a642c899a
Launcher3 : Enable cling for all devices

Don't limit cling to just phones

Change-Id: If5c1cf4ae39e5dbbac4b3d1a8d2620d365939252
Launcher3: add missing layout_width and height

fixes launcher3 fc on note 10.1

Change-Id: Id0d5b76d104c8e30041db9ba93f3267818cb758f
Launcher3 : Make priveleged app

Enable LOCAL_PRIVILEGED_MODULE for launcher.
This seems to be required to gain widget priveleges by default.

Change-Id: Iae2ce085129b39bcc3591ced5f7938d63cebf722