[Platform] Properly obtain primary WiFi MAC address on Linux

[zqiu-nest]

Reproduction steps

Currently ConfigurationManagerImpl::GetPrimaryWiFiMACAddress for Linux is only checking address not associated with the loopback interface [1], which doesn't work well for device that have other network interfaces beside WiFi (including virtual network interface that have all 0s for MAC address). Instead we should be able to check for the CHIP_DEVICE_CONFIG_WIFI_STATION_IF_NAME interface [2] to obtain the proper MAC address.

[1]: https://github.com/project-chip/connectedhomeip/blob/master/src/platform/Linux/ConfigurationManagerImpl.cpp#L143
[2]: https://github.com/project-chip/connectedhomeip/blob/master/src/include/platform/CHIPDeviceConfig.h#L357

Platform

other

Platform Version(s)

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Type

Manually tested with SDK

(Optional) If manually tested please explain why this is only manually tested

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Anything else?

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