IXP: Fix GPIO_INT_ACT_LOW_SET()

The GPIO_INT_ACT_LOW_SET was incorrectly handling interrupt lines higher than 7.
This is due to the fact that there are two registers for total of 16 lines.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Bryan Hundven <bryanhundven@gmail.com>
Cc: Michael Schwingen <rincewind@discworld.dascon.de>

arch/arm/include/asm/arch-ixp/ixp425.h

@@ -358,6 +358,9 @@
 #define IXP425_GPIO_GPCLKR      IXP425_GPIO_REG(IXP425_GPIO_GPCLKR_OFFSET)
 #define IXP425_GPIO_GPDBSELR    IXP425_GPIO_REG(IXP425_GPIO_GPDBSELR_OFFSET)
 
+#define IXP425_GPIO_GPITR(line)	(((line) >= 8) ? \
+				IXP425_GPIO_GPIT2R : IXP425_GPIO_GPIT1R)
+
 /*
  * Macros to make it easy to access the GPIO registers
  */
@@ -365,8 +368,11 @@
 #define GPIO_OUTPUT_DISABLE(line)	*IXP425_GPIO_GPOER |= (1 << (line))
 #define GPIO_OUTPUT_SET(line)		*IXP425_GPIO_GPOUTR |= (1 << (line))
 #define GPIO_OUTPUT_CLEAR(line)		*IXP425_GPIO_GPOUTR &= ~(1 << (line))
-#define GPIO_INT_ACT_LOW_SET(line)	*IXP425_GPIO_GPIT1R = \
-		(*IXP425_GPIO_GPIT1R & ~(0x7 << (line * 3))) | (0x1 << (line * 3))
+#define GPIO_INT_ACT_LOW_SET(line)				\
+	*IXP425_GPIO_GPITR(line) =				\
+			(*IXP425_GPIO_GPITR(line) &		\
+			~(0x7 << (((line) & 0x7) * 3))) |	\
+			(0x1 << (((line) & 0x7) * 3))		\
 
 /*
  * Constants to make it easy to access Timer Control/Status registers