dev: add register_candev() and unregister_candev()

dev: add register_candev() and unregister_candev()

Not all CAN devices are using the CAN device interface, like vcan or
slcan. Providing "struct can_priv" and SYSFS files for them seems
overkill. Because it's awkward to identify a device using the CAN
device interface in the netdev notifier callback, the functions
register_candev() and unregister_candev() have been introduced. All
devices using the CAN device interface should call them instead of
register_netdev() and unregister_netdev().

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
This line, and those below, will be ignored--

M    kernel/2.6/include/linux/can/dev.h
M    kernel/2.6/drivers/net/can/dev.c
M    kernel/2.6/drivers/net/can/mcp251x.c
M    kernel/2.6/drivers/net/can/mscan/mscan.c
M    kernel/2.6/drivers/net/can/softing/softing_main.c
M    kernel/2.6/drivers/net/can/sja1000/sja1000.c

git-svn-id: svn://svn.berlios.de//socketcan/trunk@905 030b6a49-0b11-0410-94ab-b0dab22257f2