Added MIC2207YML buck regulator

Datasheet: https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MIC2207-2MHz-3A-PWM-Buck-Regulator-DS20006470A.pdf

Associated MR: kicad-footprints!2797 (merged)

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• This can later be enabled via the edit button found at the top right (in case you forgot to do it when creating the merge request).

#General Guidelines: All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
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• Give a reason behind any intentional library convention rule violation.