dt-bindings: dma: ingenic: Add compatible strings for JZ4760(B) SoCs

Add ingenic,jz4760-dma and ingenic,jz4760b-dma compatible strings to
support the DMA engines present in the JZ4760 and JZ4760B SoCs.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20210120105322.16116-1-paul@crapouillou.net


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