Cleanup: fix "MHz" spelling

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 134dccb..d2e8207 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -45,7 +45,7 @@
 		udelay (50000);
 	}
 
-	/* 12Mhz I2C module clock */
+	/* 12MHz I2C module clock */
 	outw (0, I2C_PSC);
 	speed = speed/1000;		    /* 100 or 400 */
 	scl = ((12000/(speed*2)) - 7);	/* use 7 when PSC = 0 */