Use strmhz() to format clock frequencies

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/cpu/mpc5xxx/speed.c b/cpu/mpc5xxx/speed.c
index 0e3e552..8027d3e 100644
--- a/cpu/mpc5xxx/speed.c
+++ b/cpu/mpc5xxx/speed.c
@@ -81,10 +81,13 @@
 
 int prt_mpc5xxx_clks (void)
 {
-	printf("       Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
-			gd->bus_clk / 1000000, gd->ipb_clk / 1000000,
-			gd->pci_clk / 1000000);
+	char buf1[32], buf2[32], buf3[32];
 
+	printf ("       Bus %s MHz, IPB %s MHz, PCI %s MHz\n",
+		strmhz(buf1, gd->bus_clk),
+		strmhz(buf2, gd->ipb_clk),
+		strmhz(buf3, gd->pci_clk)
+	);
 	return (0);
 }