Analog reading of A10 missing

[DanielLester83]

Describe the bug
It seems that reading analog from 'A10 - IR proximity sensor' was removed, although it is still mentioned on the product page.

To Reproduce
Steps to reproduce the behavior:

1. See 'https://learn.adafruit.com/adafruit-circuit-playground-express/pinouts'
2. Go to "https://makecode.adafruit.com/#editor"
3. Click on 'input'
4. See lack of an 'IR proximity' input
5. Click on 'pins'
6. Click on 'analog read'
7. See lack of an option for 'A10'

Expected behavior
To be able to read an analog value from A10 with one method or the other.