Added "chip_info" entry to the /proc/can/channelX, contributed by Sergei Sharonov.

Code is compatible with 2.6.x and 2.4.x Linux kernels.
It would fail on 2.2.x version. If its functionality is required,
can_remove_proc_entry() has to be used on pointer stored in
the new field and code emulating create_proc_read_entry()
has to be added.