Bluetooth: btusb: print Intel fw build version in power-on boot

To determine the build version of Bluetooth firmware to ensure reported
issue related to a particular release. This is very helpful for every fw
downloaded to BT controller and issue reported from field test.

Signed-off-by: Amit K Bag <amit.k.bag@intel.com>
Signed-off-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>