Notification light(LED) settings: package mapping

Credit for this code goes to Marko Mihovilic

This commit allows for framework side override of the application
package name set for Notification light led overrides.  This is used
in cases where the user selectable application sends its notifications
via another package.

Specifically:  GTalk (com.google.android.talk) sends notifications via the
Google services framework (com.google.android.gsf).

Patch set 2  - fix derp and whitespace cleanup
Patch set 4  - fixed another derp
Patch set 5  - fixes typo in comment
Patch set 6  - remove Log.d line
Patch set 7  - allow specifying default values in application notification
               overrides

Change-Id: I0c13ae3acefa0bcb4ffb46ea7eae301081d9f8f6