tests: acpi: add a way to start tests with UEFI firmware

tests: acpi: add a way to start tests with UEFI firmware

For testcase to use UEFI firmware, one needs to provide and specify
firmware and varstore blob names in test_data { uefi_fl1, uefi_fl2 }
fields respectively and RAM start address plus size where to look for
test structure signature. Additionally testcase should specify
bootable cdrom image from uefi-boot-images with EFI test utility.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <1556808723-226478-10-git-send-email-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>