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/powermac/cpufreq_32.c b/arch/powerpc/platforms/powermac/cpufreq_32.c
index 08d94e4..d4f127d 100644
--- a/arch/powerpc/platforms/powermac/cpufreq_32.c
+++ b/arch/powerpc/platforms/powermac/cpufreq_32.c
@@ -657,31 +657,31 @@
 	cur_freq = (*value) / 1000;
 
 	/*  Check for 7447A based MacRISC3 */
-	if (machine_is_compatible("MacRISC3") &&
+	if (of_machine_is_compatible("MacRISC3") &&
 	    of_get_property(cpunode, "dynamic-power-step", NULL) &&
 	    PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
 		pmac_cpufreq_init_7447A(cpunode);
 	/* Check for other MacRISC3 machines */
-	} else if (machine_is_compatible("PowerBook3,4") ||
-		   machine_is_compatible("PowerBook3,5") ||
-		   machine_is_compatible("MacRISC3")) {
+	} else if (of_machine_is_compatible("PowerBook3,4") ||
+		   of_machine_is_compatible("PowerBook3,5") ||
+		   of_machine_is_compatible("MacRISC3")) {
 		pmac_cpufreq_init_MacRISC3(cpunode);
 	/* Else check for iBook2 500/600 */
-	} else if (machine_is_compatible("PowerBook4,1")) {
+	} else if (of_machine_is_compatible("PowerBook4,1")) {
 		hi_freq = cur_freq;
 		low_freq = 400000;
 		set_speed_proc = pmu_set_cpu_speed;
 		is_pmu_based = 1;
 	}
 	/* Else check for TiPb 550 */
-	else if (machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
+	else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
 		hi_freq = cur_freq;
 		low_freq = 500000;
 		set_speed_proc = pmu_set_cpu_speed;
 		is_pmu_based = 1;
 	}
 	/* Else check for TiPb 400 & 500 */
-	else if (machine_is_compatible("PowerBook3,2")) {
+	else if (of_machine_is_compatible("PowerBook3,2")) {
 		/* We only know about the 400 MHz and the 500Mhz model
 		 * they both have 300 MHz as low frequency
 		 */