ieee1394: add definitions for phy packet constants

Introduce new macros related to phy packets and use them in ieee1394_core and
nodemgr.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jody McIntyre <scjody@modernduck.com>

diff --cc drivers/ieee1394/ieee1394.h
Simple merge

diff --cc drivers/ieee1394/ieee1394_core.c
Simple merge

diff --cc drivers/ieee1394/nodemgr.c
Simple merge