EICON ISDN: Removed unused definitions for OS_SEEK_*

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Cc: Karsten Keil <kkeil@suse.de>
Acked-by: Armin Schindler <armin@melware.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>