Quick settings: Option to disable brightness slider (1/2)

also fixed ripple placement for dual tiles

before:
https://www.dropbox.com/s/r4m1ytiwbdbj1xw/Screenshot_2015-01-12-21-29-55.png?dl=0

after:
https://www.dropbox.com/s/lvswhsubux548xh/Screenshot_2015-01-12-21-27-31.png?dl=0



Signed-off-by: Altaf-Mahdi <altaf.mahdi@gmail.com>

Change-Id: I98a28e99e78ee4d8bb4f03bc53e867723d62b052