Set input cost as 1 for psa_key_exercise test

Signed-off-by: Kusumit Ghoderao <Kusumit.Ghoderao@silabs.com>
diff --git a/tests/src/psa_exercise_key.c b/tests/src/psa_exercise_key.c
index 8335977..c4488b5 100644
--- a/tests/src/psa_exercise_key.c
+++ b/tests/src/psa_exercise_key.c
@@ -438,10 +438,9 @@
                                                   PSA_KEY_DERIVATION_INPUT_LABEL,
                                                   input2, input2_length));
     } else if (PSA_ALG_IS_PBKDF2(alg)) {
-        data_t input_cost = { (unsigned char *) input1, (uint32_t) input1_length };
         PSA_ASSERT(psa_key_derivation_input_integer(operation,
                                                     PSA_KEY_DERIVATION_INPUT_COST,
-                                                    parse_binary_string(&input_cost)));
+                                                    1U));
         PSA_ASSERT(psa_key_derivation_input_bytes(operation,
                                                   PSA_KEY_DERIVATION_INPUT_SALT,
                                                   input2,
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 5136568..89012e9 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -6568,6 +6568,7 @@
 depends_on:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256:PSA_WANT_ALG_TLS12_PRF
 derive_key_exercise:PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256):"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":PSA_KEY_TYPE_DERIVE:400:PSA_KEY_USAGE_DERIVE:PSA_ALG_HKDF(PSA_ALG_SHA_256)
 
+# Input cost is set to 1U for testing purposes.
 PSA key derivation: PBKDF2-HMAC-SHA-256, exercise AES128-CTR
 depends_on:PSA_WANT_ALG_CTR:PSA_WANT_ALG_PBKDF2_HMAC:PSA_WANT_ALG_SHA_256:PSA_WANT_KEY_TYPE_AES
 derive_key_exercise:PSA_ALG_PBKDF2_HMAC(PSA_ALG_SHA_256):"706173737764":"01":"73616c74":PSA_KEY_TYPE_AES:128:PSA_KEY_USAGE_ENCRYPT:PSA_ALG_CTR