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/arch/powerpc/platforms/pasemi/cpufreq.c b/arch/powerpc/platforms/pasemi/cpufreq.c
index be2527a..d35e052 100644
--- a/arch/powerpc/platforms/pasemi/cpufreq.c
+++ b/arch/powerpc/platforms/pasemi/cpufreq.c
@@ -304,8 +304,8 @@
 
 static int __init pas_cpufreq_init(void)
 {
-	if (!machine_is_compatible("PA6T-1682M") &&
-	    !machine_is_compatible("pasemi,pwrficient"))
+	if (!of_machine_is_compatible("PA6T-1682M") &&
+	    !of_machine_is_compatible("pasemi,pwrficient"))
 		return -ENODEV;
 
 	return cpufreq_register_driver(&pas_cpufreq_driver);