Create an almost verbatim copy of the "OvmfPkg/AcpiPlatformDxe/AcpiPlatformDxe.inf" driver for the OvmfXen platform. We're going to trim the driver in subsequent patches. Ultimately, the XenAcpiPlatformDxe driver will duplicate a negligible amount of code that is currently present in the QemuFwCfgAcpiPlatformDxe driver. List the new driver in "Maintainers.txt", in the "OvmfPkg: Xen-related modules" section. Switch the OvmfXen platform to the new driver at once. This patch should be reviewed with "git show --find-copies-harder". Cc: Andrew Fish <afish@apple.com> Cc: Anthony Perard <anthony.perard@citrix.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Julien Grall <julien@xen.org> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20210526201446.12554-12-lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Leif Lindholm <leif@nuviainc.com>