tests/data/acpi/virt: Move ARM64 ACPI tables under aarch64/${machine} path

Same machine name can be used by different architectures. Hence, create
aarch64 folder and move all aarch64 related AML files for virt machine
inside.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20240625150839.1358279-11-sunilvl@ventanamicro.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>