dt-bindings: dma: adi,axi-dmac: deprecate adi,channels node

dt-bindings: dma: adi,axi-dmac: deprecate adi,channels node

Deprecate the adi,channels node in the adi,axi-dmac binding. Prior to
IP version 4.3.a, this information was required. Since then, there are
memory-mapped registers that can be read to get the same information.

Acked-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20241216-axi-dma-dt-yaml-v3-2-7b994710c43f@baylibre.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>