dmaengine: usb-dmac: Document SoC specific compatibility strings

In general Renesas hardware is not documented to the extent where the
relationship between IP blocks on different SoCs can be assumed although
they may appear to operate the same way. Furthermore the documentation
typically does not specify a version for individual IP blocks. For these
reasons a convention of using the SoC name in place of a version and
providing SoC-specific compatibility strings has been adopted.

Although not universally liked this convention is used in the bindings for
most drivers for Renesas hardware. The purpose of this patch is to
update the Renesas USB DMA Controller driver to follow this convention.

Cc: [email protected]
Acked-by: Rob Herring <[email protected]>
Acked-by: Yoshihiro Shimoda <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

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