OvmfPkg/VirtMmCommunicationDxe: enable loongarch64

For QEMU version support references, please see:
https://github.com/qemu/qemu/commit/e1092f765d9c0bf33762a03fe45e3d0de86c86a6

Suggested-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dongyan Qian <qiandongyan@loongson.cn>
Cc: Chao Li <lichao@loongson.cn>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Xianglai Li <lixianglai@loongson.cn>
Cc: Bo Zhu <zhubo@loongson.cn>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Mike Beaton <mjsbeaton@gmail.com>