QuickBoot: enable QuickBoot Settings UI

Add QuickBoot enable item in DevelopmentSettings.

Change-Id: Id2aaec4ad3e85f51235db4c25d49136a26502e20

Missing getActivity

Signed-off-by: task650 <task650@gmail.com>

Change wording. It bothers me. :)

Signed-off-by: task650 <task650@gmail.com>