ARM: dts: msm: enable boot LED for DB410c

Boot LED in DB410c provides a visual notification that the
boot process has started.
Boot LED will be turned-on in bootloader and will be turned-off
when HLOS display takes over.

Change-Id: I78e78e3922451eebcc6819351194cdf0352cf8e0
Signed-off-by: Shimrit Malichi <smalichi@codeaurora.org>