FreeRTOS_IPInit() MAC address argument does not work

[HirokiIshiguro]

Describe the bug
FreeRTOS_IPInit() MAC address argument does not work.
Now, following MAC address setting is used at FreeRTOSConfig.h.

    uint8_t myethaddr[6] =
    {
        configMAC_ADDR0,
        configMAC_ADDR1,
        configMAC_ADDR2,
        configMAC_ADDR3,
        configMAC_ADDR4,
        configMAC_ADDR5
    }; //XXX Fix me

System information

• Which hardware board or part numbers? -> RX65N GR-ROSE
• IDE used -> e2 studio
• Operating System [Windows|Linux|MacOS] -> xxx
• Version of Amazon FreeRTOS (run git describe --tags to find it) -> V147
• Project [Custom Application|MQTT|Shadow|Greengrass|OTA|Device Defender|TCP Echo|Sub pub Demo|Simple TCP Server] -> MQTT echo
• If your project is a Custom Application, please add the relevant code snippet in the section Code to reproduce the bug. -> xxx

Expected behavior
FreeRTOS_IPInit() can set MAC address by using argument.

Screenshots or console output
N/A

To reproduce
N/A

Code to reproduce the bug
N/A

Additional context
N/A

Thank you!