[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/windfarm_smu_sat.c b/drivers/macintosh/windfarm_smu_sat.c
index 9a6c2cf..1043b39 100644
--- a/drivers/macintosh/windfarm_smu_sat.c
+++ b/drivers/macintosh/windfarm_smu_sat.c
@@ -380,7 +380,7 @@
 	busnode = pmac_i2c_get_bus_node(bus);
 
 	while ((dev = of_get_next_child(busnode, dev)) != NULL)
-		if (device_is_compatible(dev, "smu-sat"))
+		if (of_device_is_compatible(dev, "smu-sat"))
 			wf_sat_create(adapter, dev);
 	return 0;
 }