arm64: zynqmp: Add clock driver

Add clock and reset drivers for the ZynqMP SoC.
The clocks are discovered by talking to the firmware as the topology isn't
fixed on this SoC.

Differential Revision:

arm64: zynqmp: Add clock driver

Add clock and reset drivers for the ZynqMP SoC.
The clocks are discovered by talking to the firmware as the topology isn't
fixed on this SoC.

Differential Revision: https://reviews.freebsd.org/D41812
Sponsored by: Beckhoff Automation GmbH & Co. KG

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