macbook21: Support wake on LID

Change-Id: Ifa1045abc761bef05977a8020cf6f18db042ad58
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6699
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Francis Rowe <info@gluglug.org.uk>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/mainboard/apple/macbook21/acpi/ec.asl

@@ -101,6 +101,20 @@ Device(EC)
 		{
 			return(LIDS)
 		}
+
+		Method(_PRW, 0, NotSerialized)
+		{
+			Return (Package() { 0x1d, 0x03 })
+		}
+
+		Method(_PSW, 1, NotSerialized)
+		{
+			if (Arg0) {
+				Store(1, WKLD)
+			} else {
+				Store(0, WKLD)
+			}
+		}
 	}
 
 	Device(AC)