[POWERPC] Move of_device_get_modalias to drivers/of

Commit 140b932f8cb6cced10b96860651a198b1b89cbb9 ("Create modalias file
in sysfs for of_platform bus") needs this to avoid breaking the sparc
builds.

Just move the code and add whitespace around some binary operators.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index afe3382..d3a74e0 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -24,4 +24,7 @@
 	of_release_dev(&dev->dev);
 }
 
+extern ssize_t of_device_get_modalias(struct of_device *ofdev,
+					char *str, ssize_t len);
+
 #endif /* _LINUX_OF_DEVICE_H */