proc: switch /proc/bus/zorro/devices to seq_file interface

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>