Add DMA driver and bindigns for the Amlogic SoCs.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
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Changes in v3:
- Adjust the format of binding according to Frank's suggestion.
- Some code format modified according to Frank's suggestion.
- Support one prep_sg and one submit, drop multi prep_sg and one submit.
- Keep pre state when resume from pause status.
- Link to v2: https://lore.kernel.org/r/20260127-amlogic-dma-v2-0-4525d327d74d@amlogic.com

Changes in v2:
- Introduce what the DMA is used for in the A9 SoC.
- Some minor modifications were made according to Krzysztof's suggestions.
- Some modifications were made according to Neil's suggestions.
- Fix a build error.
- Link to v1: https://lore.kernel.org/r/20251216-amlogic-dma-v1-0-e289e57e96a7@amlogic.com

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Xianwei Zhao (3):
      dt-bindings: dma: Add Amlogic A9 SoC DMA
      dma: amlogic: Add general DMA driver for A9
      MAINTAINERS: Add an entry for Amlogic DMA driver

 .../devicetree/bindings/dma/amlogic,a9-dma.yaml    |  66 +++
 MAINTAINERS                                        |   7 +
 drivers/dma/Kconfig                                |   9 +
 drivers/dma/Makefile                               |   1 +
 drivers/dma/amlogic-dma.c                          | 561 +++++++++++++++++++++
 5 files changed, 644 insertions(+)
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base-commit: 3c8a86ed002ab8fb287ee4ec92f0fd6ac5b291d2
change-id: 20251215-amlogic-dma-79477d5cd264

Best regards,
-- 
Xianwei Zhao <xianwei.zhao@amlogic.com>