This struct is superfluous, maintaining the same info as the InputInfoRec
(with the exception of the driver name).

This is a rather large commit with the majority of changes being a rename
from the fields of the IDevRec (idev, commonOptions) to the InputInfoRec
(pInfo, options).

The actual changes affect the initialization process of the input device:
In NewInputDeviceRequest, the InputInfoRec is now always allocated and just
added to the internal list in xf86NewInputDevice() if the init process
succeeded.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Tiago Vignatti <tiago.vignatti@nokia.com>