Move ADSP clock configurations from Kconfig to device tree

[ozan956]

Currently several clock configurations for the ADSP boards are defined through Kconfig options. While this approach works, it is not the most appropriate place to describe hardware topology or board-specific clock configuration.

[pamolloy]

https://bootlin.com/pub/conferences/2013/elce/common-clock-framework-how-to-use-it/common-clock-framework-how-to-use-it.pdf