[2/2] Framework: instant led test

Adds support a new notification extra boolean
EXTRA_FORCE_SHOW_LIGHTS.  Used by settings
notification light picker to force lights on
when the screen is on.

Change-Id: If0a42d32b28fe8c02ef5f7dd148db7eb478fac17
Merge "[2/2] Framework: instant led test" into cm-11.0