power: qpnp-linear-charger: Fix bug in USB path charging disable

Charging should be disabled in case of USB reset or suspend.
Disable charging if max charging current is <=2mA.

Change-Id: Ie40b5ffd855dbf97c8a7e412fe7537c24f0915cf
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>