samples: net: https_client: Fix TLS configuration for native_sim

The TLS configuration for native_sim target is currently broken, it
fails to parse the certificate used in the sample:

  net_sock_tls: Failed to parse certificate on tag 42, err: -0x3a00

That's because CONFIG_PSA_WANT_ECC_SECP_R1_384 was missing and the
certificate uses this curve. The remaining configs added were needed to
pass the handshake with the default example.com host.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

Author: rlubos

samples/net/https_client/boards/native_sim.conf

@@ -28,6 +28,9 @@ CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=7168
 CONFIG_MBEDTLS_PEM_PARSE_C=y
 CONFIG_MBEDTLS_PEM_WRITE_C=y
 CONFIG_MBEDTLS_CIPHERSUITE_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256=y
+CONFIG_MBEDTLS_CIPHERSUITE_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384=y
+CONFIG_MBEDTLS_SSL_SERVER_NAME_INDICATION=y
+CONFIG_PSA_WANT_ECC_SECP_R1_384=y
 
 # DNS
 CONFIG_DNS_RESOLVER=y