Revert "ECDH: Fix memory leaks due to context re-initialization"
Revert "ECDH: Fix memory leaks due to context re-initialization"

This reverts commit 2340f03c597b923c0f427c76b4c3d2cd11638410.

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