Cleanup: fix "MHz" spelling

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/i2c/omap1510_i2c.c b/drivers/i2c/omap1510_i2c.c
index a4e6227..f91ee88 100644
--- a/drivers/i2c/omap1510_i2c.c
+++ b/drivers/i2c/omap1510_i2c.c
@@ -32,7 +32,7 @@
 		udelay (5000);
 	}
 
-	/* 12Mhz I2C module clock */
+	/* 12MHz I2C module clock */
 	outw (0, I2C_PSC);
 	outw (I2C_CON_EN, I2C_CON);
 	outw (0, I2C_SYSTEST);