Change use of olen variables
Change use of olen variables

Removed olen variable in favour of storing olens for
client and server separately.

Signed-off-by: Thomas Daubney <5b910c8e7c225fd62319de5b44eecef1f6356fe1@arm.com>

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