Qnx: auto-detected BlackBerry kits have mutable Device field

Change-Id: Ie6881e6521b27926b0dd59800c61d9909709ccc0
Reviewed-by: David Kaspar <dkaspar@blackberry.com>
Reviewed-by: Fanda Vacek <fvacek@blackberry.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>