n80xx-common: Clean directory, added lpm mode

Fixed lpm mode charger script building (it should build as it should without touching the files in other trees).

Copied charger source files from android/core to make device specific changes. DONE (Look the sources)

Screen can be switched on after it's blanked and animation will restart.
(Now it's working, I've decided to use brightness flags for recovery)

Enabled usb charging in lpm too (Needs a mod in the kernel to allow enough current to pass through https://gerrit.omnirom.org/#/c/6286/)

If you disconnect the charger you have to manually shut the tablet off DONE
(Tablet shuts down after 10 seconds after the charger or usb is disconnected, we can change this later if needed)

EDIT: Everything seems to work, needs testing for n801x since I've rewritten the whole part which handles charger/battery status

PS13: Corrected copyright header

Change-Id: I52aa856ac4c3a357cc91b8e87fbeac4087330e68
Signed-off-by: Marco Magliona <marco.magliona@gmail.com>