Add fastcharge tile and powerwidget.  Please read below:

Overlay added to enable fastcharge widget.  You must define
the fastcharge file path and put it in the frameworks overlay
in your device tree.  Ex:
<string name="config_fastChargePath" translatable=
"false">/sys/kernel/fast_charge/force_fast_charge</string>

Change-Id: I96a0f5c39bba82f017fd2119c5a93e889c938575
Signed-off-by: scotthartbti <scott@ubuntu.com>