arm/dt: msm8974-leds: Update flash LED default settings

Update default settings for flash LED to optimize for
camera use, and set current flash LEDs to these values.

CRs-fixed: 474728
Change-Id: I9ad142eedf39ee1c3ba774863ad5571924024a33
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
Signed-off-by: Chun Zhang <chunz@codeaurora.org>