bt-mesh: deprecate BT_MESH_USES_TINYCRYPT

Since the TinyCrypt library is being deprecated in Zephyr, this
commit set TinyCrypt usage in BT mesh as deprecated and it sets
Mbed TLS PSA Crypto API as the default option (when TF-M is not
available).
Tests are also updated in this commit.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>