[POWERPC] Rename device_is_compatible to of_device_is_compatible

for consistency with other Open Firmware interfaces (and Sparc).

This is just a straight replacement.

This leaves the compatibility define in place.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index 2289034..178afa1 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -560,9 +560,9 @@
 	np = of_find_node_by_name(NULL, "fan");
 	if (!np)
 		return -ENODEV;
-	if (device_is_compatible(np, "adt7460"))
+	if (of_device_is_compatible(np, "adt7460"))
 		therm_type = ADT7460;
-	else if (device_is_compatible(np, "adt7467"))
+	else if (of_device_is_compatible(np, "adt7467"))
 		therm_type = ADT7467;
 	else
 		return -ENODEV;