[POWERPC] fsl: Add warning for unrecognized I2C nodes in the device tree

Update of_find_i2c_driver in fsl_soc.c to display a warning message if an
I2C node in the device tree isn't found in the i2c_devices[] array.
Signed-off-by: NTimur Tabi <timur@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/fsl_soc.c

@@ -448,6 +448,10 @@ static int __init of_find_i2c_driver(struct device_node *node,
 			return -ENOMEM;
 		return 0;
 	}
+
+	pr_warning("fsl_soc.c: unrecognized i2c node %s\n",
+		(const char *) of_get_property(node, "compatible", NULL));
+
 	return -ENODEV;
 }