pxa/hx4700: Fix PXA_GPIO_IRQ_BASE/IRQ_NUM values

The hx4700 platform has 72 board gpios: 64 ASIC3 gpios numbered 192..255, and
8 EGPIO gpios numbered 256..263 (plus a 9th which is not used).
Thus the new CONFIG_ARCH_NR_GPIO config option must be set to 264.
Signed-off-by: NPaul Parsons <lost.distance@yahoo.com>
Acked-by: NPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@gmail.com>

arch/arm/Kconfig

@@ -1578,6 +1578,7 @@ config ARCH_NR_GPIO
 	int
 	default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
 	default 350 if ARCH_U8500
+	default 264 if MACH_H4700
 	default 0
 	help
 	  Maximum number of GPIOs in the system.