staging: dgap: removes version.h dependency

This patch removes the version.h dependencies to the
driver.h, fep5.c and tty.c files. This header was used
to help the driver support different versions of the
kernel. The support for different versions was removed
in a previous patch.

Signed-off-by: Lidza Louina <Lidza.Louina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>