This reverts commit fd04143a47770256dabcfa4d8447127b3ec8b2bf.
This break most automated tests because with this change, if the
device is fully charged, it will simply turn off the screen, regardless
if USB is connected to hsot PC or not; so for our tests, most of them
are always connected to host PC, and fully charged 99% of the time,
as soon as the screen turns off, the front-end test Activity will be
suspended.
Change-Id: I1e6590611af43812f1bac223dd31570d1d90cfc5
d3e803ae28