[ARM] 3225/1: add symbolic names for enp2611 gpio interrupts

Patch from Lennert Buytenhek

Add symbolic names for the five ixp2400 GPIO lines on the enp2611
that are used as interrupts.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>