Cleanup: fix "MHz" spelling

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/siemens/IAD210/IAD210.c b/board/siemens/IAD210/IAD210.c
index e9e7f84..e21bb24 100644
--- a/board/siemens/IAD210/IAD210.c
+++ b/board/siemens/IAD210/IAD210.c
@@ -240,7 +240,7 @@
 	iop->iop_padir = 0x0800;
 
 	/* start timer 2 for the 4hz LED blink rate */
-	timers->cpmt_tmr2 = 0xff2c;	/* 4hz for 64mhz */
+	timers->cpmt_tmr2 = 0xff2c;	/* 4HZ for 64MHz */
 	timers->cpmt_trr2 = 0x000003d0;	/* clk/16 , prescale=256 */
 	timers->cpmt_tgcr = 0x00000810;	/* run timer 2 */