DO NOT MERGE Add new permission to allow access to USB devices

Adds permission android.permission.ACCESS_USB.
This is a partial cherry pick of a change from master.
It adds the permission, but not the support for associating it
the AID_USB group.

Change-Id: If5816721a4fc88bf444141a7b717da65ea37d5f4
Signed-off-by: Mike Lockwood <lockwood@android.com>