fbdev: amifb: add missing MODULE_DESCRIPTION() macro

With ARCH=m68k, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/video/fbdev/amifb.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/amifb.c

@@ -3782,5 +3782,6 @@ static struct platform_driver amifb_driver __refdata = {
 
 module_platform_driver_probe(amifb_driver, amifb_probe);
 
+MODULE_DESCRIPTION("Amiga builtin chipset frame buffer driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:amiga-video");