staging: unisys: include: iochannel needs to include skbuff

The iochannel.h header file references ETH_HLEN which is defined in
skbuff. Removed it from visorhba since it was no longer needed.

Reviewed-by: Sameer Wadgaonkar <sameer.wadgaonkar@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>