Make uefi-test compilable to linux-pc

Enable uefi variable authentication in libts and create uefi direct
backend to provide signature verification API that would normally be
accessible with using the crypto SP.

Change-Id: I1d95981ef5b2b4ee75438565c1e4cf82eadbab40
Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
3 files changed