mach-imx: iomux-v3: add a define for the SION bit

SION (Software Input On Field) - force the select mode input path

Signed-off-by: Angus Ainslie <angus@akkea.ca>
diff --git a/arch/arm/include/asm/mach-imx/iomux-v3.h b/arch/arm/include/asm/mach-imx/iomux-v3.h
index 9330a32..231b9c0 100644
--- a/arch/arm/include/asm/mach-imx/iomux-v3.h
+++ b/arch/arm/include/asm/mach-imx/iomux-v3.h
@@ -243,6 +243,7 @@
 
 #endif
 
+#define IMX_PAD_SION		0x40000000
 #define IOMUX_CONFIG_SION	0x10
 
 #define GPIO_PIN_MASK		0x1f