[PATCH] Don't build some broken ISDN drivers on big endian MIPS

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>