net: dsa: mt7530: do not set priv->p5_interface on mt7530_setup_port5()

Running mt7530_setup_port5() from mt7530_setup() used to handle all cases
of configuring port 5, including phylink.

Setting priv->p5_interface under mt7530_setup_port5() makes sure that
mt7530_setup_port5() from mt753x_phylink_mac_config() won't run.

The commit ("net: dsa: mt7530: improve code path for setting up port 5")
makes so that mt7530_setup_port5() from mt7530_setup() runs only on
non-phylink cases.

Get rid of unnecessarily setting priv->p5_interface under
mt7530_setup_port5() as port 5 phylink configuration will be done by
running mt7530_setup_port5() from mt753x_phylink_mac_config() now.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20240122-for-netnext-mt7530-improvements-1-v3-6-042401f2b279@arinc9.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>