Sensor_Audio: Add LGA footprint for Knowles SPH0641LU4H-1
This add an LGA footprint for a digital MEMS microphone. The datasheet is here: https://media.digikey.com/pdf/Data%20Sheets/Knowles%20Acoustics%20PDFs/SPH0641LU4H-1.PDF
The symbol for this part is here: https://github.com/KiCad/kicad-symbols/pull/2952
Edited by Joel Guittet