clk: Move rockchip driver into the common directory

No need to keep it under sys/arm64/rockchip/clk
It's easier to find which controller we support by looking under one directory.

Sponsored by: B

clk: Move rockchip driver into the common directory

No need to keep it under sys/arm64/rockchip/clk
It's easier to find which controller we support by looking under one directory.

Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D43189

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