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>
diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c
index 694841d..b80a389 100644
--- a/arch/arm/cpu/arm926ejs/mx25/generic.c
+++ b/arch/arm/cpu/arm926ejs/mx25/generic.c
@@ -111,7 +111,7 @@
 	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