of: add 'of_' prefix to machine_is_compatible()

machine is compatible is an OF-specific call.  It should have
the of_ prefix to protect the global namespace.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/net/mace.c b/drivers/net/mace.c
index d9fbad3..43aea91 100644
--- a/drivers/net/mace.c
+++ b/drivers/net/mace.c
@@ -206,7 +206,7 @@
 		mp->port_aaui = port_aaui;
 	else {
 		/* Apple Network Server uses the AAUI port */
-		if (machine_is_compatible("AAPL,ShinerESB"))
+		if (of_machine_is_compatible("AAPL,ShinerESB"))
 			mp->port_aaui = 1;
 		else {
 #ifdef CONFIG_MACE_AAUI_PORT