drivers: i2s: add sai support for stm32n6xx
This commit adds specific DMA configuration for STM32N6xx.
STM32N6xx uses GPDMA for SAI as STM32U5xx/U3xx/H5xx/H7RS etc.
In constrast to these series, STM32N6xx DMA requires a secure
and privileged channel.
Signed-off-by:
Mario Paja <mariopaja@hotmail.com>
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