dt-bindings: fsl-dma: fsl-edma: add edma3 compatible string

Extend Freescale eDMA driver bindings to support eDMA3 IP blocks in
i.MX8QM and i.MX8QXP SoCs. In i.MX93, both eDMA3 and eDMA4 are now.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20230821161617.2142561-12-Frank.Li@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>