hp/pavilion_m6_1035dx: Add ACPI support for lid switch

This is sufficient to at least allow linux to recognize the lid switch
and read its state correctly.

Change-Id: Id5bd92466c72559f263c7ca8d23cbc741377a762
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/5464
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl

@@ -71,3 +71,15 @@
 		Store("Received PNOT call (probably from EC)", Debug)
 		/* TODO: Implement this */
 	}
+
+Scope (\_SB) {
+	Device (LID0)
+	{
+		Name(_HID, EisaId("PNP0C0D"))
+		Method(_LID, 0)
+		{
+			Store (GE22, \LIDS)
+			Return (\LIDS)
+		}
+	}
+}