Staging: ramzswap: remove unused #include <linux/version.h>

Remove unused #include <linux/version.h>('s) in
  drivers/staging/ramzswap/ramzswap_drv.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>