LockScreen: Option to hide initial page hints (1/2)

This will add an option to hide the initial page hints
that are shown left and right when the device is turned on.

Change-Id: Id4f29f7cfbaca6b4dd91f0b2de2b8195a966259b
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
SystemUI: ExpandHelper AOSP Bugs

1. weird popping issue when swiping open notifications because
   mHasPopped was not set properly
2. glow could get stuck because it was not reset at view-change

Patchset2: whitespaces

Change-Id: Icce241e82043cbcc1a28b902e78494fefd16f993