net: stmmac: rename stmmac_phy_setup() to include phylink

net: stmmac: rename stmmac_phy_setup() to include phylink

stmmac_phy_setup() does not set up any PHY, but does setup phylink.
Rename this function to stmmac_phylink_setup() to reflect more what
it is doing.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/E1v945d-0000000Ameh-3Bs7@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>