Build: Correct typo in QCBOR/t_cose test enabling

Replace TFM_PARTITION_ATTESTATION with the correct
TFM_PARTITION_INITIAL_ATTESTATION.

Change-Id: Ia7294da43e2acff2eb573b158a8deb758bb732c0
Signed-off-by: Raef Coles <raef.coles@arm.com>
2 files changed