serial: sh-sci: Document r8a77470 bindings

RZ/G1C (R8A77470) SoC also has the R-Car gen2 compatible SCIF and HSCIF
ports, so document the SoC specific bindings.

Signed-off-by: Biju Das <[email protected]>
Reviewed-by: Fabrizio Castro <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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