[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/sound/ppc/tumbler.c b/sound/ppc/tumbler.c
index 54e333f..5821cdd 100644
--- a/sound/ppc/tumbler.c
+++ b/sound/ppc/tumbler.c
@@ -1060,7 +1060,7 @@
   
 	for (np = of_get_next_child(gpiop, NULL); np;
 			np = of_get_next_child(gpiop, np)) {
-		if (device_is_compatible(np, name))
+		if (of_device_is_compatible(np, name))
 			break;
 	}  
 	of_node_put(gpiop);