Revert hdmi_clock changes

It is still connected to clkc 16 because we have an older design.
Revert this commit when the design has been upgraded.

This reverts commit 30f9d253ba21950da383938d50f6ddf8b13f7795.
This reverts commit ad9b7ee56d6f3d4b3682daecb219ce46069ac250.
This reverts commit 7ebe0e94803d3cfa97ccc0200247f9a10850399c.
This reverts commit dc9b6a0cdeaf19357547ea9a7468b61f6bdad00c.