clk: spacemit: Add clock support for SpacemiT K1 SoC

The clock tree of K1 SoC contains three main types of clock hardware
(PLL/DDN/MIX) and has control registers split into several multifunction
devices: APBS (PLLs), MPMU, APBC and APMU.

All register operations are done through regmap to ensure atomicity
between concurrent operations of clock driver and reset,
power-domain driver that will be introduced in the future.

Signed-off-by: Haylen Chu <[email protected]>
Reviewed-by: Alex Elder <[email protected]>
Reviewed-by: Inochi Amaoto <[email protected]>
Reviewed-by: Yixun Lan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Yixun Lan <[email protected]>

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