riscv: dts: canaan: Add clock definition for K230

This patch describes the clock controller integrated in K230 SoC
and replace dummy clocks with the real ones for UARTs.

For k230-canmv and k230-evb, they provide an additional external
pulse input through a pin to serve as clock source.

Co-developed-by: Troy Mitchell <TroyMitchell988@gmail.com>
Signed-off-by: Troy Mitchell <TroyMitchell988@gmail.com>
Signed-off-by: Xukai Wang <kingxukai@zohomail.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

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