A workaround for Windows 7 ACPI SLIC table behavior when used with OVMF

When OVMF is used, Windows 7 refuses to read SLIC ACPI table, passed via -acpitable option, because it expects oem id and oem table id to match in SLIC, XSDT, RSDT, FADT. There's a detailed discussion here: https://bugzilla.redhat.com/show_bug.cgi?id=1248758