staging: nvec: ps2: change serio type to passthrough

This changes the serio type of the nvec_ps2 mouse port to passthrough.
The old 8042 type seems appropiete for keyboards only.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>