samples: net: http_client: replace legacy Mbed TLS deps with PSA API

Replace selection of legacy Mbed TLS Kconfigs with PSA Crypto API ones.

While at this, add also a test case using "overlay-tls.conf" since this
is also mentioned in README file.

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