Align to PSA Attestation API tests

Fixes psa-api-test/initial_attestation deployments for linux_pc
and arm-linux.  Also includes changes to enable tests to obtain
the public IAK and fetch and verify attestation token.  The
attestation psa arch test currently fails because of a
hard-coded expectation that the attestation token only
contains a single sw component.  On Linux platforms, there
are multiple sw components.  Other verification checks on
the attestation token  pass.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: I7b380b8d1478bc340b5a4b133799c231f64942ff
20 files changed