[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/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 94a542e..79711aa 100644
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -157,7 +157,7 @@
 		if (!vtermno)
 			continue;
 
-		if (device_is_compatible(vty, "hvterm1")) {
+		if (of_device_is_compatible(vty, "hvterm1")) {
 			hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
 			++num_found;
 		}