psa: Add initializers for cipher operation objects

Add new initializers for cipher operation objects and use them in our
tests and library code. Prefer using the macro initializers due to their
straightforwardness.
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 8275a1c..6ba61ba 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -755,6 +755,9 @@
 depends_on:MBEDTLS_CMAC_C:MBEDTLS_AES_C
 mac_verify:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":PSA_ALG_TRUNCATED_MAC(PSA_ALG_CMAC, 4):"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411":"dfa66747"
 
+Cipher operation object initializers zero properly
+cipher_operation_init:
+
 PSA cipher setup: good, AES-CTR
 depends_on:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CTR
 cipher_setup:PSA_KEY_TYPE_AES:"000102030405060708090a0b0c0d0e0f":PSA_ALG_CTR:PSA_SUCCESS