Use different state variables for focus/exposure/whitebalance locks and update the exposure and whitebalance variables explicitly, since BB10 doesn't provide a status callback method as for focus. Change-Id: Ie6ba8f6a2a27f317c39994d21be8549c99daef6d Reviewed-by: Fabian Bumberger <fbumberger@rim.com> Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>