ARM: dts: msm: configure WLED full scale current

WLED supports full scale current upto 30mA. Set
the full scale current to 16mA to avoid panel
burn-outs.

Change-Id: I57463e443056470899527bced2bc3af1179660be
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>