CA-124378: Default acpi_s{3,4} to 0 in platformdata

Backport of patch xenopsd.git#acd1002b736414

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
Merge pull request #1810 from jonludlam/CA-124378-creedence

CA-124378: Default acpi_s{3,4} to 0 in platformdata