net: stmmac: Make stmmac_xpcs_setup() generic to all PCS devices

A pcs_init() callback will be introduced to stmmac in a future patch. This
new function will be called during the hardware initialization phase.
Instead of separately initializing XPCS and PCS components, let's group all
PCS-related hardware initialization logic in the current
stmmac_xpcs_setup() function.

Rename stmmac_xpcs_setup() to stmmac_pcs_setup() and move the conditional
call to stmmac_xpcs_setup() inside the function itself.

Signed-off-by: Serge Semin <[email protected]>
Co-developed-by: Romain Gantois <[email protected]>
Signed-off-by: Romain Gantois <[email protected]>
Reviewed-by: Russell King (Oracle) <[email protected]>
Reviewed-by: Hariprasad Kelam <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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