[PATCH v8] dmaengine: mediatek-cqdma: add dt-bindings and remove redundant queue

[EastL Lee]

This patch set adds document the devicetree bindings for MediaTek Command-Queue DMA controller,
and remove redundant queue structure.

hanges since v6:
- fix dt binding format

hanges since v5:
- fix full name

hanges since v4:
- fix yaml & dma-mask code flow

hanges since v3:
- fix dt_binding_check errors

Changes since v2:
- add devicetree bindings for MediaTek Command-Queue DMA controller

Changes since v1:
- remove redundant queue structure
- fix wrong description and tags in the earlier patch
- add dma-channel-mask for DMA capability
- fix compatible for common