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[top,dma] Connect SPI device to the DMA
This PR connects the SPI device to the DMA to be able to be used with the DMA hardware handshake mode. Doing so, this PR adds the following changes:
- Add a watermark LSIO trigger to the SPI device
- Add a SPI device LSIO trigger to the SOC Proxy (It removes one external LSIO trigger for that)
- Re-generate top to hook up the new signals