firewire: restore the device.h include in linux/firewire.h

firewire: restore the device.h include in linux/firewire.h

Commit 313162d0b83836e2f57e51b9b8650fb4b9c396ea

    "device.h: audit and cleanup users in main include dir"

exchanged an include <linux/device.h> for a struct *device
but in actuality I misread this file when creating 313162d
and it should have remained an include.

There were no build regressions since all consumers were
already getting device.h anyway, but make it right regardless.

Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>