ec/lenovo/h8: return correctly typed package if battery is absent

Fixes "Discharge rate invalid message" and fwts error.

Change-Id: I51f9d819f164552567d75f83c95ba7523e97343e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6793
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

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

@@ -223,7 +223,7 @@ Device (BAT0)
 		if (B0PR) {
 			Return (BSTA(0, BATI, B0CH, B0DI))
 		} else {
-			Return (BATS)
+			Return (Package () { 0, 0, 0, 0 })
 		}
 	}
 
@@ -281,7 +281,7 @@ Device (BAT1)
 		if (B1PR) {
 			Return (BSTA(0x10, BATI, B1CH, B1DI))
 		} else {
-			Return (BATS)
+			Return (Package () { 0, 0, 0, 0 })
 		}
 	}