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23aba459f5
Adds CONFIG_SPIRAM_ENC_EXEMPT, available on chips that support per-page PSRAM encryption configuration (esp32c5, esp32c61, esp32p4). When enabled, esp_psram carves CONFIG_SPIRAM_ENC_EXEMPT_SIZE off the top of PSRAM and maps it via the new mmu_hal_map_region_no_enc() helper, which writes MMU entries without the SENSITIVE bit. The region is registered as a separate heap pool reachable only through the new MALLOC_CAP_SPIRAM_NO_ENC capability bit, so default SPIRAM allocations cannot accidentally land there. PSRAM encryption imposes alignment constraints that some DMA engines (e.g. 2D-DMA) cannot satisfy. This option lets such workloads place their buffers in unencrypted PSRAM while keeping the rest of PSRAM (and flash) encrypted. Default disabled; security implications are documented in the Kconfig help text.