firewire: clean up includes

Include required headers which were only indirectly included.
Remove unused includes and an unused constant.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --cc drivers/firewire/fw-card.c
Simple merge

diff --cc drivers/firewire/fw-device.c
Simple merge

diff --cc drivers/firewire/fw-iso.c
Simple merge

diff --cc drivers/firewire/fw-ohci.c
Simple merge

diff --cc drivers/firewire/fw-sbp2.c
Simple merge

diff --cc drivers/firewire/fw-topology.c
Simple merge

diff --cc drivers/firewire/fw-transaction.c
Simple merge