lights: Adding keypad alt/shift LED light IDs

in conjunction with the keyboard light patch for
frameworks/base:
http://review.cyanogenmod.org/77945

Change-Id: Ie97a80d398d474950340cba60c48ba5904978ec5
Merge pull request #1 from SlimRoms/lp5.0

lights: Adding keypad alt/shift LED light IDs