Restore setUsbFunctions to LegacyUsbDeviceManager for USB Tethering

Change-Id: I5d6a45d639cc666b5ef8b84cbbbd8d53461a4d80
Center tablet mobile icon, remove double icon in tablet notification

Change-Id: I7cf68268585fc29dda6b735bc588e2ccd7faf8e6
Remove WindowManagerService dp hack; allow tablet ui at 600dp

Change-Id: I2105028b7548ab446e21e961c5f313631b271713
Merge remote-tracking branch 'sgt7/cm-10.1' into cm-10.1-sgt7-linaro