ARM: dts: msm: change WLED interrupt configuration for pm660l

Currently, WLED over-voltage and short-circuit fault interrupts
are configured for both rising and falling edge. Configure them
to be on rising edge alone as that should be sufficient.

Change-Id: I9e19cf08e77432a4db5f18894ee445d38f1ad802
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>