Crypto: Update to Mbed TLS 3.6.1

Update the CMake checkout dependency and re-align the
headers to the ones available in Mbed TLS 3.6.1.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I681df1f2662c55b7aaf7eed2642b7ce3eeae8192
diff --git a/interface/include/mbedtls/ecdh.h b/interface/include/mbedtls/ecdh.h
index a0909d6..a6a5069 100644
--- a/interface/include/mbedtls/ecdh.h
+++ b/interface/include/mbedtls/ecdh.h
@@ -325,7 +325,7 @@
  * \brief           This function sets up an ECDH context from an EC key.
  *
  *                  It is used by clients and servers in place of the
- *                  ServerKeyEchange for static ECDH, and imports ECDH
+ *                  ServerKeyExchange for static ECDH, and imports ECDH
  *                  parameters from the EC key information of a certificate.
  *
  * \see             ecp.h