This patch adds the LED_BRIGHTNESS_FAST flag to allow the driver to
indicate that the brightness_set() callback is implemented on a fastpath
so that the LED core may choose to for example use a hrtimer to
implement the duration of a trigger for better timing accuracy.
Change-Id: Ib52a6d6f432d30e56fd5de5f3c9740f0e47530bf
Suggested-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: David Lin <dtwlin@google.com>
273cd61c7c