Security
   * Fix a potential heap buffer overread in TLS 1.2 server-side when
     MBEDTLS_USE_PSA_CRYPTO is enabled, an opaque key (created with
     mbedtls_pk_setup_opaque()) is provisioned, and a static ECDH ciphersuite
     is selected. This may result in an application crash. No path to
     information leak has been identified.


Add ChangeLog for potential overread with USE_PSA
Add ChangeLog for potential overread with USE_PSA

The issue was fixed while adding support for static ECDH with Opaque
keys: https://github.com/Mbed-TLS/mbedtls/pull/5624

This is just adding the ChangeLog entry for that fix.

Signed-off-by: Manuel Pégourié-Gonnard <4ba0d615aeeda88e422ca8fba28fe2938485facf@arm.com>
