Bluetooth: btbcm: Add entry for BCM2076B1 UART Bluetooth

Add the device ID for the BT/FM/GPS combo chip BCM2076 (rev B1)
used in the AMPAK AP6476 WiFi/BT/FM/GPS module.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>