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Drivers that allocate from the unencrypted PSRAM carve-out via MALLOC_CAP_SPIRAM_NO_ENC currently have no way to verify after the fact which pool a buffer came from. This is particularly relevant for callers using heap_caps_malloc_prefer(MALLOC_CAP_SPIRAM_NO_ENC, MALLOC_CAP_SPIRAM), where a silent fallback to encrypted PSRAM would still pass the typical esp_ptr_external_ram() check. Expose esp_psram_ptr_is_no_enc() in the public esp_psram.h header. It performs a range check against the carve-out's virtual-address window and returns false when PSRAM is not initialized or CONFIG_SPIRAM_ENC_EXEMPT is disabled, so callers do not need to guard the call site with #if. Also reference the helper from the External RAM documentation alongside the heap_caps_malloc(MALLOC_CAP_SPIRAM_NO_ENC) usage example.