Add support for parsing stm32 dma consumer cells, format of which follows dma dts format declared in the Linux Kernel for the dma of stm32: https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/plain/Bindings/dma/stm32-dma.txt Signed-off-by: Song Qiang <songqiang1304521@gmail.com>