soc: atmel_sam0: Introduce DMA CTLR macro

Add a macro similar to ATMEL_SAM0_DT_INST_DMA_NAME but instead
provides the devicetree node back via DT_INST_DMAS_CTLR_BY_NAME

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
1 file changed