fixed AirM2M_CORE_ESP32C3 upload.tool.serial & write_flash error #7375
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Description of Change
Please describe your proposed Pull Request and it's impact.
This PR fix 2 errors so that we can upload the compiled firmware successfully to AirM2M_CORE_ESP32C3 board.
Property 'upload.tool.serial' is undefined
Failed uploading: uploading error: exit status 2
Tests scenarios
Please describe on what Hardware and Software combinations you have tested this Pull Request and how.
I have tested my Pull Request on Arduino-esp32 core v2.0.5 with AirM2M_CORE_ESP32C3 Board with this scenario.
Related links
Please provide links to related issue, PRs etc.
(eg. Closes #number of issue)