drivers: staging: rtl8172: Remove unneeded include of version.h

The output of "make versioncheck" told us that:

drivers/staging/rtl8712/osdep_service.h: 32 linux/version.h not needed.
drivers/staging/rtl8712/rtl871x_ioctl_linux.c: 46 linux/version.h not needed.

If we take a look at these files, we will agree to remove it.

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Cc: <devel@driverdev.osuosl.org>
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
ACKed-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>