[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/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 1870038..373de4c 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -448,7 +448,7 @@
 
 	/* Look for cascade */
 	for_each_node_by_type(np, "interrupt-controller")
-		if (device_is_compatible(np, "chrp,iic")) {
+		if (of_device_is_compatible(np, "chrp,iic")) {
 			pic = np;
 			break;
 		}