power: pm8921-charger: Disable EOC FSM processing

Due to the premature firing of end of charging
interrupts pmic8921-charger fully relies on the
eoc_worker. To avoid having to reset BATFET we turn
off FSM eoc processing.

Change-Id: Ic18666e8d8596106a88870664f69fab4a7ccac95
Signed-off-by: David Keitel <dkeitel@codeaurora.org>