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* [bsp][stm32] Add stm32n657-st-nucleo BSP
* style: format STM32 HAL drivers and STM32N657 BSP with clang-format
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- Unify DMA/BDMA/GPDMA descriptors in drv_dma (common fields + per-type union)
- Support BDMA in SPI driver with h7 dma/spi config header updates
- Add SPI6 TX/RX BDMA Kconfig options for H7
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snapshot scheduler and interrupt state once per SPI message
reuse the message-level async route decision for all split chunks
disable DMA and interrupt paths consistently when async transfer is unavailable
avoid mixed async and polling policies within one logical SPI transfer
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preload the actual HAL receive buffer with 0xFF for receive-only transfers
rename spi_dma_flag to spi_xfer_flags to match DMA and interrupt flags
clarify SPI async completion and transfer-mode comments
add Doxygen comments for STM32 SPI runtime structures and handlers
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introduce interrupt transfer route selection and SPI IRQ visibility macros
unify DMA and INT completion handling with timeout-triggered abort recovery
keep short transfers on polling and use DMA or INT only when eligible
refine STM32 SPI init and IRQ registration paths for mixed transfer backends
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refine the stm32 hard spi dma configuration hierarchy with shared feature macros
align dma flag usage with rt-device dma flags and gate dma-only fields and paths
make the dma transfer threshold configurable through BSP_SPI_DMA_TRANS_MIN_LEN
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- add drv_dma common helpers and stm32_dma_config descriptors for STM32 series
- refactor i2c, spi, usart, qspi, and sdio DMA setup and deinit paths to reuse the common layer
- unify DMA IRQ enable, rollback handling, and const board-level DMA configuration usage
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calculation
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- move all normal drivers (devices framework drivers) into drivers
folder.
- create nano folder for nano drivers
nano drivers are only for a simply wrap of the HAL function, and
not seek for adopting rt-thread devcies framework.
- provide unified nano console and GPIO drivers.
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