net: caif: remove unused structs

'cfpktq' has been unused since
commit 73d6ac63 ("caif: code cleanup").

'caif_packet_funcs' is declared but never defined.

Remove both of them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>