Cleanup: fix "MHz" spelling

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/cpu/s3c44b0/cpu.c b/cpu/s3c44b0/cpu.c
index fd09bf9..2960f2f 100644
--- a/cpu/s3c44b0/cpu.c
+++ b/cpu/s3c44b0/cpu.c
@@ -256,7 +256,7 @@
 
 	/*
 		Enable ACK, IICCLK=MCLK/16, enable interrupt
-		75Mhz/16/(12+1) = 390625 Hz
+		75MHz/16/(12+1) = 390625 Hz
 	*/
 	rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xC);
 	IICCON = rIICCON;