linux-imx

Input: iforce - introduce transport ops

In order to tease apart the driver into core and transport modules, let's
introduce transport operations and make "xmit" the very first one such
operation.

Tested-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>