Add declaration of dock registers 1, 2 and 3.

Needed to make dock work on X201.

Change-Id: Id0b32266cacf04bb48530bedf50818c268f947ec
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4081
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)

src/ec/lenovo/h8/acpi/ec.asl

@@ -38,10 +38,14 @@ Device(EC)
 	OperationRegion(ERAM, EmbeddedControl, 0x00, 0x100)
 	Field (ERAM, ByteAcc, NoLock, Preserve)
 	{
+		Offset (0x02),
+				DKR1, 1,        /* Dock register 1 */
 		Offset (0x05),
 				HSPA, 1,
 		Offset (0x0C),
 				LEDS, 8,	/* LED state */
+		Offset (0x1a),
+				DKR2, 1,        /* Dock register 2 */
 		Offset (0x2a),
 				EVNT, 8,	/* write will trigger EC event */
 		Offset (0x3a),
@@ -57,7 +61,10 @@ Device(EC)
 				TMP0, 8,	/* Thermal Zone 0 temperature */
 				TMP1, 8,	/* Thermal Zone 1 temperature */
 		Offset (0x81),
-				PAGE, 8		/* Information Page Selector */
+				PAGE, 8,	/* Information Page Selector */
+		Offset (0xfe),
+				    , 4,
+				DKR3, 1        /* Dock register 3 */
 	}
 
 	Method (_CRS, 0)