Add Fe-Pi Audio Z V2 board

draft/overlay/fepi-audio-z-V2.md

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+<!--
+---
+name: Fe-Pi Audio Z V2
+class: board
+type: audio
+formfactor: pHAT
+manufacturer: Fe-Pi
+collected: Other
+description: A complete audio solution for the Raspberry Pi
+url: https://fe-pi.com/products/fe-pi-audio-z-v2
+buy: https://fe-pi.com/products/fe-pi-audio-z-v2
+image: 'fepi-audio-z-V2.png'
+pincount: 40
+eeprom: no
+power:
+  '1':
+  '2':
+ground:
+  '6':
+  '9':
+  '14':
+  '20':
+  '25':
+  '30':
+  '34':
+  '39':
+pin:
+  '3':
+    mode: i2c
+  '5':
+    mode: i2c
+  '12':
+    name: BCLK (Bit Clock)
+    mode: i2s
+  '35':
+    name: LRCLK (Left/Right Clock)
+    mode: i2s
+  '38':
+    name: DIN (Data In)
+    mode: i2s
+  '40':
+    name: DOUT (Data Out)
+    mode: i2s
+i2c:
+  '0x0a':
+    name: SGTL5000
+    device: SGTL5000XNAA3/R2
+-->
+#Fe-Pi Audio Z V2
+
+The Fe-Pi Audio Z V2 is designed to provide a complete low cost audio solution for Raspberry Pi 2, 3, and Zero, needing line-in, line-out, headphone-out/mic-in, and stereo speakers.
+
+## Features ##
+
+* Small Raspberry Pi Zero PCB footprint.
+* SGTL5000 low power stereo codec.
+* 3.5 mm, 4 contact, jack for Headphone/MIC (black).
+* 3.5 mm jack for stereo Line Out (green), and stereo Line In (pink).
+* ADC > 90 dB SNR and -72 dB THD+N
+* Line-Out > 100 dB SNR and -85 dB THD+N
+* HP Output > 100 dB SNR and -80 dB THD+N, 62.5 mW max into 16 ohm.
+* Hardware level controls for Headphone Volume, Line In, Line Out. ALSA support.
+* 2x20pin 2.54mm female header and 40pin male breakable header included!
+* Optional RCA jack for Composite Video output when used with Raspberry Pi Zero.