[ARM] 4565/1: s3c2443: fix section mismatch in irq.c file

This patch removes section mismatches related to irq functions.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>