Change the code places of CERTIFICATE_REQUEST
Change the code places of CERTIFICATE_REQUEST

Change-Id: I3aa293184fea4f960782675bdd520256c808bd4e
Signed-off-by: XiaokangQian <7b6134ba682adad72773df97eb8737186a67b798@arm.com>

ARMmbed/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls