Make the lock screen camera widget configurable (2/2)

Change-Id: I704ddeb4a1b8ba4537d961334138b6661f8dbc31
(cherry picked from commit f7ee74ea876f44778a98bdc299576798d6c1e15a)

Conflicts:
	res/values/cm_strings.xml
	res/xml/lockscreen_interface_settings.xml
Bring back Camera widget option for tablets

Starting from ~2014-01-29, Camera widget is also shown on tablets.
That's actually a good thing, so let's bring back the option to
make it configurable.

Change-Id: I56f51b70eca4ef528dc91a13c658d33d43a90dec
(cherry picked from commit 8704ab0db6ec552ee8ebe11f857cd111e8df536f)