Use strmhz() to format clock frequencies

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/cpu/mpc8220/speed.c b/cpu/mpc8220/speed.c
index c01ca0c..62ac845 100644
--- a/cpu/mpc8220/speed.c
+++ b/cpu/mpc8220/speed.c
@@ -109,10 +109,14 @@
 
 int prt_mpc8220_clks (void)
 {
-	printf ("       Bus %ld MHz, CPU %ld MHz, PCI %ld MHz, VCO %ld MHz\n",
-		gd->bus_clk / 1000000, gd->cpu_clk / 1000000,
-		gd->pci_clk / 1000000, gd->vco_clk / 1000000);
+	char buf1[32], buf2[32], buf3[32], buf4[32];
 
+	printf ("       Bus %s MHz, CPU %s MHz, PCI %s MHz, VCO %s MHz\n",
+		strmhz(buf1, gd->bus_clk),
+		strmhz(buf2, gd->cpu_clk),
+		strmhz(buf3, gd->pci_clk),
+		strmhz(buf4, gd->vco_clk)
+	);
 	return (0);
 }