power: smb1355: Extend minoff-time and dead-time for SMB1355

To improve OVP handling increase the min-offtime and dead-time
as per hardware recommendation.

Change-Id: I28040808d6c114b718aad0e0ab63554683e7746f
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>