qualcommax: ipq60xx: set correct PHY mode for port 0-4

qualcommax: ipq60xx: set correct PHY mode for port 0-4

[port 8ed390a (qualcommax: set correct PHY mode for port 0-4) to ipq60xx]

Port 0-4 have the mode set to SGMII instead of PSGMII. Now that we use
he upstream qca807x driver, this conflicts with the qca SSDK driver
that expects the mode to be PSGMII as for not integrated driver, it does
refer to the real PHY mode.

Update the entry for port 0-4 to PSGMII to solve warning from qca SSDK
in ipq6018-ess.dtsi.

Signed-off-by: Mantas Pucka <mantas@8devices.com>