ta: pkcs11: remove redundant comment about start and end date

PKCS#11 standard specifies that verification or usage of start and end
date for certificate objects is responsibility of the application.

There is no other activity than storage needed for those.

Signed-off-by: Vesa Jääskeläinen <vesa.jaaskelainen@vaisala.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

ta/pkcs11/src/pkcs11_attributes.c

@@ -1351,9 +1351,6 @@ enum pkcs11_rc check_created_attrs_against_token(struct pkcs11_session *session,
 		return PKCS11_CKR_SESSION_READ_ONLY;
 	}
 
-	/*
-	 * TODO: START_DATE and END_DATE: complies with current time?
-	 */
 	return PKCS11_CKR_OK;
 }