omap4 i2c: add support for i2c bus 4

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
diff --git a/arch/arm/include/asm/arch-omap4/i2c.h b/arch/arm/include/asm/arch-omap4/i2c.h
index a91b4c2..02ee2f8 100644
--- a/arch/arm/include/asm/arch-omap4/i2c.h
+++ b/arch/arm/include/asm/arch-omap4/i2c.h
@@ -23,7 +23,7 @@
 #ifndef _OMAP4_I2C_H_
 #define _OMAP4_I2C_H_
 
-#define I2C_BUS_MAX	3
+#define I2C_BUS_MAX	4
 #define I2C_DEFAULT_BASE	I2C_BASE1
 
 struct i2c {