net: stmmac: Add dedicated XPCS cleanup method

Currently the XPCS handler destruction is performed in the
stmmac_mdio_unregister() method. It doesn't look good because the handler
isn't originally created in the corresponding protagonist
stmmac_mdio_unregister(), but in the stmmac_xpcs_setup() function. In
order to have more coherent MDIO and XPCS setup/cleanup procedures,
let's move the DW XPCS destruction to the dedicated stmmac_pcs_clean()
method.

This method will also be used to cleanup PCS hardware using the
pcs_exit() callback that will be introduced to stmmac in a subsequent
patch.

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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