[ARM] 3902/1: Enable GPIO81-84 on PXA255

The PXA255 has 84 GPIO lines available.  This patch allows access to 81-84
Signed-off-by: Craig Hughes <craig@gumstix.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/arch-pxa/irqs.h

@@ -73,7 +73,7 @@
 #define IRQ_TO_GPIO(i)	(((i) < IRQ_GPIO(2)) ? ((i) - IRQ_GPIO0) : IRQ_TO_GPIO_2_x(i))
 
 #if defined(CONFIG_PXA25x)
-#define PXA_LAST_GPIO	80
+#define PXA_LAST_GPIO	84
 #elif defined(CONFIG_PXA27x)
 #define PXA_LAST_GPIO	127
 #endif