Fix mcxn build by providing the RNG for TZ_PSA builds

[AlexLanzano]

Summary

Fixes the nxp_mcxn_tz_psa_test and nxp_mcxn_tz_psa_hw_test builds, which started failing after the wolfSSL submodule bump to 5.8.2. The new release added a compile-time check that refuses WC_NO_RNG together with any blinding macro (WC_RSA_BLINDING / WOLFSSL_CURVE25519_BLINDING / WOLFSSL_ECC_BLIND_K) — and the MCXN TZ-PSA test-app build was hitting exactly that combination.

Changes

• test-app/Makefile: stop defaulting TEST_APP_NO_RNG=1 for mcxn when WOLFCRYPT_TZ_PSA=1. The TZ-PSA build already has a PSA-backed entropy source on the NS side (hal_trng_psa.c → psa_generate_random), so there's no reason to force-disable the RNG. The default is unchanged for mcxa/mcxw and for the non-PSA mcxn configs.

• test-app/wcs/user_settings.h: when WOLFCRYPT_TZ_PSA is set, wire CUSTOM_RAND_GENERATE_BLOCK to a thin shim over hal_trng_get_entropy(). This gives wolfCrypt a working RNG without pulling in HASHDRBG, and routes every random byte through the PSA TRNG.

Note

I don't have the hardware to test this change

[Copilot]

Pull request overview

This PR updates the test application build and wolfCrypt/wolfSSL user settings to ensure TrustZone PSA (WOLFCRYPT_TZ_PSA) builds on MCX targets (notably mcxn) have a functional RNG source, instead of defaulting to WC_NO_RNG.

Changes:

• Add a PSA-mode RNG hook in test-app/wcs/user_settings.h by wiring CUSTOM_RAND_GENERATE_BLOCK to hal_trng_get_entropy().
• Adjust test-app/Makefile so MCX targets only default to TEST_APP_NO_RNG=1 when not building with WOLFCRYPT_TZ_PSA=1.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test-app/wcs/user_settings.h	Adds a PSA-specific CUSTOM_RAND_GENERATE_BLOCK implementation using hal_trng_get_entropy().
test-app/Makefile	Avoids forcing WC_NO_RNG defaults on MCX targets when WOLFCRYPT_TZ_PSA=1 is enabled.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.