[ainyan03]

Summary

Require bootloader_support on ESP-IDF 5.3 and later (before ESP-IDF 6).

Bus_SPI checks <esp_flash_encrypt.h> to decide whether external RAM may be a DMA source on chips with AHB GDMA v2 or AXI DMA (ESP32-P4, ESP32-C5, ESP32-C61). The header belongs to bootloader_support, which the component did not require. On ESP-IDF 5 builds the header was therefore not visible, the check fell back to "flash encryption enabled", and data in external RAM was always sent by the CPU instead of DMA. No error or warning was shown. Arduino builds see all include directories and already used DMA; ESP-IDF 6 uses the efuse API and is unchanged.

Up to ESP-IDF 5.2 the header also includes spi_flash_mmap.h, which bootloader_support does not export, so those versions are left as they are (CPU path).

The comment in Bus_SPI about ESP-IDF 6 is also corrected: the header is still public there, but esp_flash_encryption_enabled() is deprecated.

Testing

• ESP-IDF 5.3.1 / 5.4.3 (ESP32-P4) and 5.5.3 (ESP32-C61): bootloader_support/include is now on the include path and esp_flash_encryption_enabled is referenced from the SPI bus code. ESP-IDF 5.1 / 5.2 and 6.1 builds are unchanged.
• Build check on ESP-IDF 5.1 / 5.2 / 5.3 / 5.4 / 5.5 / 6.0 / 6.1 and Arduino core 2.0 / 3.x for the supported chips passed.
• Not tested on hardware with an ESP-IDF-only build. The DMA path that is enabled here is the one Arduino builds already use.
• Fork CI passed.