Updated ledflasher sample to use trait/component model
 - light schema onOff trait
 - dynamically add components based on available LEDs from lights HAL
 - custom trait _ledInfo to save lights HAL LED names

BUG:26798554
Change-Id: I4c1dd0cdb2f3479703e9082fea152a713178e65c
(cherry picked from commit 72d5a0e9b7fc812a880ab4e1f5795324e5ebf9a9)
9 files changed