[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/sbuslib.h

@@ -20,5 +20,7 @@ extern int sbusfb_mmap_helper(struct sbus_mmap_map *map,
 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
 			struct fb_info *info,
 			int type, int fb_depth, unsigned long fb_size);
+long sbusfb_compat_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg, struct fb_info *info);
 
 #endif /* _SBUSLIB_H */