Added symbol Filter_EMI_LL_1243 needed for footprints L_CommonModeChoke_Coilcraft_????USB.

This symbol is required in order to be able to use footprints in: kicad-footprints!2262 (merged)

Datasheets

• https://www.coilcraft.com/pdfs/0603usb.pdf
• https://www.coilcraft.com/pdfs/0805usb.pdf
• https://www.coilcraft.com/pdfs/1812can.pdf