ARM: dts: msm: Add led flash support for Kona platforms

Flash led source needs to be a part of image sensor in order to
use the LED functionality. This change adds appropriate flash LED
source to respective image sensor.

Change-Id: If43cab70325b3fb6f652556873b6173afd0333a7
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>