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cmn_refclk_<p/m> lines in Torrent SERDES are used for connecting an external reference clock. cmn_refclk_<p/m> can also be configured to output the reference clock. Model this derived reference clock as a "clock" so that platforms like AM642 EVM can enable it. This is used by PCIe to use the same refclk both in local SERDES and remote device. Add support here to drive refclk out. Based on: https://lore.kernel.org/all/20210310120840.16447-7-kishon@ti.com/ Signed-off-by: George McCollister <george.mccollister@konsulko.com> Tested-by: Bryan Brattlof <bb@ti.com>