drivers: mspi: mspi_dw: Add DMA and Async support

Initial DMA and Asychronous transaction support. Currently,
the async mode doesn't support concurrent transactions
or timeout and will fail a transcieve request if one is in progress.
DMA supports implementation of SSI IP but using vendor
specific DMA in the wrapper.

Signed-off-by: David Jewsbury <[email protected]>

Author: Hi-Im-David

drivers/mspi/Kconfig.dw

@@ -6,4 +6,3 @@ config MSPI_DW
 	default y
 	depends on DT_HAS_SNPS_DESIGNWARE_SSI_ENABLED
 	select PINCTRL if $(dt_compat_any_has_prop,$(DT_COMPAT_SNPS_DESIGNWARE_SSI),pinctrl-0)
-	imply MSPI_XIP