MX25 print arm clock instead of mpllclk on boot

Replace call to imx_get_mpllclk with imx_get_armclk
to show frequency of ARM core instead of mpll internal
bus in print_cpuinfo.

Signed-off-by: John Rigby <jcrigby@gmail.com>
CC: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm926ejs/mx25/generic.c

@@ -111,7 +111,7 @@ int print_cpuinfo (void)
 	char buf[32];
 
 	printf ("CPU:   Freescale i.MX25 at %s MHz\n\n",
-		strmhz (buf, imx_get_mpllclk ()));
+		strmhz (buf, imx_get_armclk ()));
 	return 0;
 }
 #endif