ARM: dts: msm: change WLED interrupt configuration for pmi8998

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: I7cdaf126c07daa9afb2c0db68ee760a9a4a2956a
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>