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mbedtls 4.x is PSA-first: CONFIG_MBEDTLS_SHA256_C now maps to PSA_WANT_ALG_SHA_256, and on ESP targets the hardware SHA accelerator serves SHA-256 through PSA, leaving the legacy MBEDTLS_SHA256_C builtin macro undefined. The inner guard on pbkdf2_sha256 was gating on bare MBEDTLS_SHA256_C, so the function was compiled out and NAN ND-PMK derivation (nan_derive_nd_pmk_from_passphrase) failed to link. Guard on (MBEDTLS_SHA256_C || PSA_WANT_ALG_SHA_256) to match the idiom already used elsewhere in the supplicant mbedtls port (tls_mbedtls.c), covering both the legacy builtin and PSA-provided SHA-256.
'wpa_supplicant'
This component contains the upstream wpa_supplicant ported for ESP family of platforms. The code is tightly coupled with esp_wifi component which has ESP WiFi libraries and header files that are used in ported supplicant.
ESP uses MbedTLS as crypto library therefore MbedTLS component is also required for some features to work(see ESP_WIFI_MBEDTLS_CRYPTO).
To port it for different OS, esp_wifi and wpa_supplicant should be picked up a whole system(preferably with MbedTLS if we want all features to work.)