ARM: dts: msm: add sync delay for wled

Add sync delay for PMIC wled to allow proper delay
between sync and sync_reset commands. Add recommended
value for fullscale current to support optimal
brightness. This is applicable for all chips using
PMi8994.

Change-Id: I495bf990056116a4e3a0ca449d8370b2a8611af8
CRs-fixed: 924313
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>