Attest: Remove out-dated comment

Remove an out-dated comment about the limitations
that attestation service is not able to sign the token.
This limitation was removed a long ago, comment was left
in the code accidentally.

Change-Id: I3f6e15fa1a62123820970587ecb2dce8d5680c26
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
diff --git a/secure_fw/services/initial_attestation/attestation_core.c b/secure_fw/services/initial_attestation/attestation_core.c
index beb93a3..04dbafc 100644
--- a/secure_fw/services/initial_attestation/attestation_core.c
+++ b/secure_fw/services/initial_attestation/attestation_core.c
@@ -1073,11 +1073,6 @@
     return attest_err;
 }
 
-/* Limitations of the current implementation:
- *  - Token is not signed yet properly, just a fake signature is added to the
- *    token due to lack of psa_asymmetric_sign() implementation in crypto
- *    service.
- */
 psa_status_t
 initial_attest_get_token(const psa_invec  *in_vec,  uint32_t num_invec,
                                psa_outvec *out_vec, uint32_t num_outvec)
@@ -1128,7 +1123,6 @@
     return error_mapping_to_psa_status_t(attest_err);
 }
 
-/* Initial implementation, just returns with hard coded value */
 psa_status_t
 initial_attest_get_token_size(const psa_invec  *in_vec,  uint32_t num_invec,
                                     psa_outvec *out_vec, uint32_t num_outvec)