Bluetooth: btusb: print FW version after FW download

After FW download there is no print to confirm the current
FW version. Add print to check FW version incase of FW download.

Signed-off-by: Amit K Bag <amit.k.bag@intel.com>
Signed-off-by: Yoni Shavit <yshavit@chromium.org>
Signed-off-by: Chethan Tumkur Narayan <chethan.tumkur.narayan@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>