[SBUSFB]: implement ->compat_ioctl

This patch adds a new function, sbusfb_compat_ioctl() to
drivers/video/sbuslib.c and uses it as compat_ioctl in all sbus fb
drivers

This remove the last per-arch compat ioctl bits in
arch/sparc64/kernel/ioctl32.c so it would be nice if people could test
if this actually copiles and works and if yes apply it :)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/video/ffb.c

@@ -57,6 +57,9 @@ static struct fb_ops ffb_ops = {
 	.fb_sync		= ffb_sync,
 	.fb_mmap		= ffb_mmap,
 	.fb_ioctl		= ffb_ioctl,
+#ifdef CONFIG_COMPAT
+	.fb_compat_ioctl	= sbusfb_compat_ioctl,
+#endif
 };
 
 /* Register layout and definitions */