Merge tag 'u-boot-clk-24Aug2020' of https://gitlab.denx.de/u-boot/custodians/u-boot-clk

- Add CCF clocks definitions for iMX6Q enet (ETH)
- Several fixes for CCF framework - the most notable is the one, which
  adds get_rate helper to clk-mux.c
- Improvements for clk command - better visibility and alignment.