drm/vboxvideo: Remove unused including <linux/version.h>

Remove including <linux/version.h> that don't need it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190320015429.86347-1-yuehaibing@huawei.com

drivers/gpu/drm/vboxvideo/vbox_drv.h

@@ -14,7 +14,6 @@
 #include <linux/io.h>
 #include <linux/irqreturn.h>
 #include <linux/string.h>
-#include <linux/version.h>
 
 #include <drm/drm_encoder.h>
 #include <drm/drm_fb_helper.h>