Add Everest Semi ES8388 audio codec symbol

Datasheet: http://www.everest-semi.com/pdf/ES8388%20DS.pdf

Footprint PR: kicad-footprints!3713 (merged)

Pinout from datasheet:

Note regarding KLC checker warning: VREF is indeed a power output, where a decoupling capacitor must be connected. It isn't an input.