superio/fintek/f81216h: Add the correct unlock key values

The actual key values were not added in commit 17ace8255.
TEST: amd/lamar shows the correct result.

Change-Id: I8f20e3d0ce83dd87b6c233ee98c3e77a6b7c1b03
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/8375
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Tested-by: Marc Jones <marc.jones@se-eng.com>

src/superio/fintek/f81216h/f81216h.h

@@ -35,10 +35,10 @@
  * See page 17 of data sheet for details.
  */
 typedef enum {
-	MODE_6767,
-	MODE_7777,
-	MODE_8787,
-	MODE_A0A0,
+	MODE_6767 = 0x67,
+	MODE_7777 = 0x77,
+	MODE_8787 = 0x87,
+	MODE_A0A0 = 0xA0,
 } mode_key;
 
 void f81216h_enable_serial(pnp_devfn_t dev, u16 iobase, mode_key k);