bluetooth: do not fatally error on unknown packet types

The bcm4356 in nx sends unknown packets, but it is not fatal if
they are not handled.

Co-authored-by: Billy Laws <blaws05@gmail.com>
Co-authored-by: Thomas Makin <halorocker89@gmail.com>

Change-Id: I0db97491d8a57add810aabdb133b7c29c736dcad