QuickBoot: enable QuickBoot Settings UI

Add QuickBoot enable item in DevelopmentSettings.

Change-Id: Id2aaec4ad3e85f51235db4c25d49136a26502e20
Settings: update Privacy Guard help text string

Fix tiny error plus shorten string a bit

Change-Id: I3453d677a5bce8d8f58539d71283d47fe4a4cbf4
Signed-off-by: Ricky Salinas <rsalinas1@mail.usf.edu>