[POWERPC] Create modalias file in sysfs for of_platform bus

Create /sys/bus/of_platform/devices/*/modalias file to allow autoloading
of modules.  Modalias files are already present for many other bus types.
This adds also a newline to the devspec files.

Also create a devspec file for mac-io devices.  They were created as a
side effect.  Use correct buffer size for mac-io modalias buffer.

Tested on iBook1 and Efika.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index ca09a63..298de0f 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -17,6 +17,8 @@
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 
+extern struct device_attribute of_platform_device_attrs[];
+
 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct of_device *of_dev = to_of_device(dev);
@@ -103,6 +105,7 @@
 	bus->suspend = of_platform_device_suspend;
 	bus->resume = of_platform_device_resume;
 	bus->shutdown = of_platform_device_shutdown;
+	bus->dev_attrs = of_platform_device_attrs;
 	return bus_register(bus);
 }