ARM: dts: msm: Change SMB1390 IRQ type configuration

Modify IRQ's type which gets fired on change in switcher operation
state, to trigger on both rising and falling edge to catch switcher
enablement and disablement status.

Change-Id: I5e64073f35d45200899b23825e6ee1d2338e1015
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>