clk: ti: clkctrl clock support

* Tero Kristo [off-list ref] [170213 05:24]:

Hi,

This series is a derivative of the hwmod clock support framework
(https://www.spinics.net/lists/arm-kernel/msg536742.html.) This
adds support for clkctrl main and optional clocks, which can be
linked initially with hwmod framework, and later with the
interconnect driver functionality. The implementation is based
on the DT bindings patch from Tony:
https://patchwork.kernel.org/patch/9533605/

Probably best to merge that binding patch along with this series,
so feel free to pick it.

Regards,

Tony