NUCLEO_F439ZI/mbedtls: add SHA256 hw_acceleration

[adustm]

Description

Enable HW acceleration for SHA256 algorithm on STM32F439ZI

Status

READY

Migrations

If this PR changes any APIs or behaviors, give a short description of what API users should do when this PR is merged.

YES | NO

Steps to test or reproduce

To test this feature, you have to modify TESTS/mbedtls/selfttest/main.cpp in order to call sha256 self test:
add:
#include "mbedtls/sha256.h"
then

#if defined(MBEDTLS_SHA256_C)
MBEDTLS_SELF_TEST_TEST_CASE(mbedtls_sha256_self_test)
#endif

then

#if defined(MBEDTLS_SHA256_C)
    Case("mbedtls_sha256_self_test", mbedtls_sha256_self_test_test_case),
#endif

[adustm]

+-------------------+---------------+------------------------+-----------------------------+--------+--------+--------+--------------------+
| target            | platform_name | test suite             | test case                   | passed | failed | result | elapsed_time (sec) |
+-------------------+---------------+------------------------+-----------------------------+--------+--------+--------+--------------------+
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_aes_self_test       | 1      | 0      | OK     | 0.55               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_base64_self_test    | 1      | 0      | OK     | 0.12               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_ccm_self_test       | 1      | 0      | OK     | 0.12               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_ctr_drbg_self_test  | 1      | 0      | OK     | 0.12               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_ecp_self_test       | 1      | 0      | OK     | 2.81               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_entropy_self_test   | 1      | 0      | OK     | 0.08               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_gcm_self_test       | 1      | 0      | OK     | 2.6                |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_hmac_drbg_self_test | 1      | 0      | OK     | 0.06               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_mpi_self_test       | 1      | 0      | OK     | 0.25               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_rsa_self_test       | 1      | 0      | OK     | 0.31               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_sha256_self_test    | 1      | 0      | OK     | 0.24               |
| NUCLEO_F439ZI-IAR | NUCLEO_F439ZI | tests-mbedtls-selftest | mbedtls_sha512_self_test    | 1      | 0      | OK     | 1.72               |
+-------------------+---------------+------------------------+-----------------------------+--------+--------+--------+--------------------+

[sg-]

@adustm Can this be moved against the workshop branch?