dt-bindings: serial: Add compatible for Renesas RZ/T2H SoC in sci

dt-bindings: serial: Add compatible for Renesas RZ/T2H SoC in sci

RSCI of RZ/T2H SoC (a.k.a r9a09g077), as a lot
of similarities with SCI in other Renesas SoC like G2L, G3S, V2L;
However, it has a different set of registers, and in addition to serial,
this IP also supports SCIe (encoder), SmartCard, i2c and spi.
This is why the 'renesas,sci' fallback for generic SCI does not apply for it.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Thierry Bultel <thierry.bultel.yh@bp.renesas.com>
Link: https://lore.kernel.org/r/20250403212919.1137670-4-thierry.bultel.yh@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>