drivers: spi: smartbond: remove default enabling of dma acceleration

The Smartbond SPI driver enables DMA acceleration by default. However
no DMA configuration is provided in the SPI node, resulting in run
time errors when the SPI interface is used. Instead, the application
should explicitly enable DMA acceleration and select the DMA channels
and priorities.

Signed-off-by: Ian Morris <ian.d.morris@outlook.com>

Author: iandmorris

drivers/spi/Kconfig.smartbond

@@ -11,10 +11,9 @@ config SPI_SMARTBOND
 
 config SPI_SMARTBOND_DMA
 	bool "Renesas Smartbond(tm) SPI with DMA acceleration"
-	default y
 	depends on SPI_SMARTBOND
 	select DMA
 	help
 	  Enables using the DMA engine instead of interrupt-driven
 	  approach. This acceleration is available only for
-	  asynchronous transfers.
+	  synchronous transfers.