doc: release-notes-3.7: Additional crypto note

This add some additional information about crypto TinyCrypt and
PSA Crypto.

Signed-off-by: Flavio Ceolin <[email protected]>

Author: Flavio Ceolin

doc/releases/release-notes-3.7.rst

@@ -1418,6 +1418,8 @@ Libraries / Subsystems
 
 * Crypto
 
+  * TinyCrypt remains available but is now being phased out in favor
+    of PSA Crypto for enhanced security and performance.
   * Mbed TLS was updated to 3.6.0. Release notes can be found at:
     https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0
   * When any PSA crypto provider is available in the system