[ARM] pxa: move I2C pin configurations out into board specific files

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/mainstone.c b/arch/arm/mach-pxa/mainstone.c
index f2c7ad8..5f22496 100644
--- a/arch/arm/mach-pxa/mainstone.c
+++ b/arch/arm/mach-pxa/mainstone.c
@@ -128,6 +128,10 @@
 	GPIO108_KP_MKOUT_5,
 	GPIO96_KP_MKOUT_6,
 
+	/* I2C */
+	GPIO117_I2C_SCL,
+	GPIO118_I2C_SDA,
+
 	/* GPIO */
 	GPIO1_GPIO | WAKEUP_ON_EDGE_BOTH,
 };