Changed prototypes for CAN core exported functions to use ifindex

Changed prototypes for CAN core exported functions to use ifindex
instead of *dev to hold the dev-pointer only very local and to reduce
locking issues.
Removed some handling in the raw/bcm notifiers that caused the system to
crash, when removing the network driver under heavy load on the fly.
TODO:
Put notifier into protocol opt structure to make kmalloc/kfree obsolete.
Handle the notifiers with RCU lists.
Put notifier list 'device dependend' into dev_rcv_lists.
After that check for better notifier handling.

git-svn-id: svn://svn.berlios.de//socketcan/trunk@334 030b6a49-0b11-0410-94ab-b0dab22257f2