linux-imx

net: mscc: ocelot: introduce more focused PCS ops for PHYLINK

The reason for doing this is that the 2 mainline Ocelot switches so far,
VSC7514 and VSC9959, have radically different SoC/SerDes integration. So
although the PHYLINK callbacks are common, the implementations will
actually lie in device-specific function pointers.

Also, there was a duplicated and unused function pointer for pcs_init in
struct ocelot, remove that.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>