dt-bindings: net: broadcom-bluetooth: Document BCM4329 support

The BCM4329 is a 802.11 a/b/g/n WiFi + Bluetooth 2.1 chip which is found
in Azurewave AW-NH611 WiFi+BT module.

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