power: qpnp-linear-charger: fix interrupt request failure

USBIN irq is a threaded interrupt, add IRQF_ONESHOT flag
while requesting interrupt.

Change-Id: I3e37e18d117fe9de336c2a89652a2adcb0e9d9d6
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>