added USB_C_6pins

Hello,

I recently bought some usb-c connector on aliexpress. I didn't found any footprint on kicad do I made one based on an existing one, the only difference is that they expose only 6 pins

I didn't found any datasheet but this is the link from where i took them: https://it.aliexpress.com/item/32966491026.html

Symbol PR: https://github.com/KiCad/kicad-symbols/pull/2495