dev: pqnp_wled: change max precharge time to 500us

There is an issue that lab precharge failure when fast precharge is
disable and battery voltage is very low. Change max precharge time
to 500us to avoid this case.

CRs-Fixed: 1028320
Change-Id: I88196e131e36961fd2a8328e999bb0155da618d0
2 files changed