Documentation: Drop reference to dead "eicon" kernel paramter.

Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com>
Acked-by: NArmin Schindler <armin@melware.de>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>

Documentation/kernel-parameters.txt

@@ -614,9 +614,6 @@ and is between 256 and 4096 characters. It is defined in the file
 			Format: {"of[f]" | "sk[ipmbr]"}
 			See comment in arch/i386/boot/edd.S
 
-	eicon=		[HW,ISDN]
-			Format: <id>,<membase>,<irq>
-
 	eisa_irq_edge=	[PARISC,HW]
 			See header of drivers/parisc/eisa.c.