ASoC: dt-bindings: renesas,rsnd.yaml: add R-Car Gen4 support

There are no compatible for "reg/reg-names" and "clock-name"
between previous R-Car series and R-Car Gen4.

"reg/reg-names" needs 3 categorize (for Gen1, for Gen2/Gen3, for Gen4),
therefore, use 3 if-then to avoid nested if-then-else.

Move "clock-name" detail properties to under allOf to use if-then-else
for Gen4 or others.

Link: https://lore.kernel.org/all/[email protected]/#r
Link: https://lore.kernel.org/all/[email protected]/#r
Link: https://lore.kernel.org/all/[email protected]/#r
Link: https://lore.kernel.org/all/[email protected]/#r
Reported-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Kuninori Morimoto <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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