Fix compile without CONFIG_I2C

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/devices.c

@@ -68,6 +68,10 @@ static void omap_init_i2c(void)
 	(void) platform_device_register(&omap_i2c_device2);
 }
 
+#else
+
+static void omap_init_i2c(void) {}
+
 #endif
 
 /*-------------------------------------------------------------------------*/