[PATCH] Fix PXA-27x/3xx interrupts when CONFIG_PXA_HAVE_ISA_IRQS=y

[Eric Miao]

> From 50390cb82a10921b91a25f5908fdcacdf624017c Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz at taxman.wild-wind.fr.eu.org>
> Date: Tue, 3 Nov 2009 20:35:19 +0100
> Subject: [PATCH] Fix pxa27x/3xx interrupts when CONFIG_PXA_HAVE_ISA_IRQS=y
>
> Commit d2c37068429b29d6549cf3486fc84b836689e122 ([ARM] pxa:
> initialize default interrupt priority and use ICHP for IRQ handling)
> broke ISA interrupt support on pxa27x/3xx.
>
> In such a case, PXA_IRQ(0) != 0, and the IRQ number computed from
> ICHP must be offset by PXA_IRQ(0).
>
> Tested on an Arcom Zeus (pxa270), with both CONFIG_PXA_HAVE_ISA_IRQS
> enabled and disabled.
>
> Signed-off-by: Marc Zyngier <maz at misterjones.org>

Applied to 'fix.