arm64: dts: qcom: lemans-evk: Enable 2.5G Ethernet interface

arm64: dts: qcom: lemans-evk: Enable 2.5G Ethernet interface

Enable the QCA8081 2.5G Ethernet PHY on port 0. Add MDC and MDIO pin
functions for ethernet0, and enable the internal SGMII/SerDes PHY node.
Additionally, support fetching the MAC address from EEPROM via an nvmem
cell.

Signed-off-by: Mohd Ayaan Anwar <quic_mohdayaa@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Wasim Nazir <wasim.nazir@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250916-lemans-evk-bu-v5-10-53d7d206669d@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>