power: qpnp-linear-charger: Fix charger UI updation issue

Move power_supply_changed call outside the if check in
fastchg_irq_handler. This handles the case when the irq
is fired before the fastchg_irq is registered by the driver
during bootup. The change ensures uvents are sent out whenever
the irq handler is dispatched.

Change-Id: Iffba58dcf140a98edb1432ac35cd9dd6f8023b3d
Signed-off-by: Shilpa Suresh <sbsure@codeaurora.org>