Bluetooth: hci_bcm: Add device-tree compatible for BCM4329

Driver supports BCM4329, but there is no device-tree compatible for
that chip. Let's add it in order to allow boards to specify Bluetooth
in theirs device-trees, in particular this is useful for NVIDIA Tegra20
boards.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>