power: smb5-lib: Ignore repetitive PD_ACTIVE notice in PD session

If PD hard reset occurs while PD session is underway, charger driver
may receive duplicative PD_ACTIVE messages from PD driver. Handling
them is unnecessary and incurs delay, which may lead to another hard
reset.

No operation for repetitive PD_ACTIVE message while PD is active.

Change-Id: If7f4f5efd47808716085c612ecd1c60e220d3ef9
Signed-off-by: Harry Yang <harryy@codeaurora.org>