[ARM] pxa: allow IRQ_BOARD_END to be customized and make zylonite to use it

The default value is 16 IRQs. Zylonite needs 32, ASIC3 based boards need 70.

My problem is still that due to the way IRQ_GPIO is hardcoded, ASIC3 based boards
need 70 IRQs starting at IRQ_BOARD_START. If I define ASIC3 IRQs similar to LoCoMo
or SA1111, things break as soon as something selects PXA_HAVE_BOARD_IRQS.
Increasing the default number of board IRQs to 70 instead doesn't seem very nice.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index 47747f9..3b34f34 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -280,6 +280,7 @@
 	select PXA3xx
 	select PXA_SSP
 	select HAVE_PWM
+	select PXA_HAVE_BOARD_IRQS
 
 config MACH_LITTLETON
 	bool "PXA3xx Form Factor Platform (aka Littleton)"