arm/dt: msm8610: Add correct mode for leds

Recent patches require led mode be explicitly set, rather
than defaulting to "manual" mode.  Set mode to be
"manual" so wled and homerow led continue to work as
expected.

Change-Id: I43d6197ad631ca9afaba02b7416529e763ffe6b3
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>