dt-bindings: dma: convert MediaTek High-Speed controller to the json-schema

This helps validating DTS files. Introduced changes:
1. Adjusted "reg" in example
2. Added includes to example

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240213063919.20196-1-zajec5@gmail.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>