power: pm8921-charger: Ignore TCHG_MAX/TTRKL_MAX timer

Allow charging to exceed TCHG_MAX for the specific purpose
of devices operating at high power consumption leading them
to be charged at very low current, thus taking longer than
TCHG_MAX (512 min). The hardware charge timers are not currently
in use on PM8921 and SW charging is controlled by eoc_worker.

CRs-Fixed: 316009
Change-Id: Iff18d4d086802a96865572564cf00a268c855c33
Signed-off-by: David Keitel <dkeitel@codeaurora.org>