fbdev: vfb: add missing MODULE_DESCRIPTION() macro

With ARCH=x86, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/video/fbdev/vfb.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/vfb.c

@@ -546,5 +546,6 @@ static void __exit vfb_exit(void)
 
 module_exit(vfb_exit);
 
+MODULE_DESCRIPTION("Virtual Frame Buffer driver");
 MODULE_LICENSE("GPL");
 #endif				/* MODULE */