dt-bindings: i2c: realtek,rtl9301-i2c: extend for clocks and RTL9607C support

dt-bindings: i2c: realtek,rtl9301-i2c: extend for clocks and RTL9607C support

Add the "realtek,rtl9607-i2c" compatible for i2c controller on the
RTL9607C SoC series.

Add a clocks property to the properties to describe the i2c reference
clock and make it available for all the compatibles. This i2c reference
clock is assumed to be coming from switchcore region via Lexra bus as
the other SoC peripherals.

According to the info available about the existing devices, they also
have the i2c master controller clocks.

RTL9607C requires the "realtek,scl" and "clocks" to be specified
and so handle it under separate if check for "realtek,rtl9607-i2c".

Signed-off-by: Rustam Adilov <adilov@disroot.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260401180648.337834-6-adilov@disroot.org