Frameworks: add support for devices without multi-color LED

Change-Id: Ied3514f4fdd9511c75926eb3d9e48d6d1425bc43
fb: small observer multiuser correction on notificationlight

Change-Id: I3bbe4c772f801e3edfc97f9e17000b03c861dd1f
Revert "Finish fixing Zygote descriptor leakage problem"

This reverts commit cefbeb866429744223dff05d734658c28fbb3f6b.

Change-Id: Iaa26627cf05bc65fa6068bd87faef37b9348ddcf