staging: unisys: visorhid: rename to visorinput

This visorhid driver provides a Human Interface Device, but is not at all
using HID, the protocol.  It's a plain input driver, so for clarity, it is
being renamed to visorinput.

Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>