power: smb1355-charger: Update the WD BITE timeout to 8secs

The default timeout of 1sec may not be enough time for SW
to PET the watchdog (after a bark). Update this to 8secs.

Change-Id: I65882067783100e7b9ecdc1e697b93948945b4eb
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>