remove useless comment
remove useless comment

Signed-off-by: Jerry Yu <c6cd1413a9492a82cc7fe506fb3a273f7dc9927d@arm.com>

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