Adding module version in order to be able to identify driver in use.

Using (upstream) kernel version driver's code from as a driver version.

Index: src/drivers/gpu/drm/mgag200/mgag200_drv.c
===================================================================
--- src.orig/drivers/gpu/drm/mgag200/mgag200_drv.c	2017-06-20 20:40:30.541976989 +0200
+++ src/drivers/gpu/drm/mgag200/mgag200_drv.c	2017-06-20 20:40:49.310698789 +0200
@@ -145,3 +145,4 @@
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
+MODULE_VERSION("4.11.0_dup7.3");