refactor the options shown for tablets and phablets

added isPhablet and hasPhoneAbility to remove certain
preferences

PS2: added config bools for charging led and led brightness
PS3: remove FastToggle for Phablets

Change-Id: Ic7f9a17553a5652a15941ff34fe2badec1431fcd
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>