tests: tfm_regression_test: Add missing TFM provision dependency

The TF-M regression test has enabled the Initial Attestation Partition.
On the nordic platform we don't provision with dummy keys, so the device
has to be provisioned properly in order to run this test.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>

tests/tfm/tfm_regression_test/prj.conf

@@ -17,6 +17,9 @@ CONFIG_TFM_PARTITION_CRYPTO=y
 CONFIG_TFM_PARTITION_INITIAL_ATTESTATION=y
 CONFIG_TFM_PARTITION_PLATFORM=y
 
+# Initial Attestation service requires provisioning
+CONFIG_TFM_NRF_PROVISIONING=y
+
 # Enable IPC mode and isolation level 2 by default
 CONFIG_TFM_IPC=y
 CONFIG_TFM_ISOLATION_LEVEL=2