Multiple LEDs [3/3]: Illumination Bars support

Implement the support of a multiple LEDs settings.

The setting is deactivated by default
and will be ignored by the unimplemented phones.
Current LibLights will simply not use the new variable.

Changes includes :
  frameworks/base
  hardware/libhardware
  packages/Apps/Settings

Change-Id: Ie8712c13e43f823996f10ca83b4a9f95fb750e96
Signed-off-by: AdrianDC <radian.dc@gmail.com>