This patch adds Xen ACPI tables support to OVMF. Use EFI_ACPI_TABLE_PROTOCOL to publish all Xen ACPI tables in OVMF, while keeping the Qemu and KVM support. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Bei Guan <gbtju85@gmail.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13541 6f19259b-4bc3-4df7-8a09-765794883524