Multiple LEDs [2/3]: 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: I5531093cd0543d7730a8c3f83c0aebb3678436d5
Signed-off-by: AdrianDC <radian.dc@gmail.com>