[esomx] map ADC channels to the correct pins

[technobly]

NOTE: This PR should also be backported to 4.x

Problem

ESoMX ADC pins were mapped incorrectly, which caused analogRead(A0~A7) to fail.

Solution

Remap the ADC channel/pins per Boron/BSoM mapping.

Steps to Test

• Run the example app below and look for correct behavior with a 10k potentiometer connected to 3.3V and GND, wiper on the pin under test. Set the pot to about halfway. This should be about 5k ohms of impedance and give a stable reading. Walk the connection between A0 - A7 as the test advances. The reading should be stable.
• Run TEST=wiring/no_fixture and GPIO_08_DigitalReadWorksMixedWithAnalogRead should pass.

Example App

#include "Particle.h"
SYSTEM_MODE(SEMI_AUTOMATIC);
SYSTEM_THREAD(ENABLED);
Serial1LogHandler log1Handler(115200, LOG_LEVEL_ALL);
SerialLogHandler logHandler(LOG_LEVEL_ALL);

void setup() {
    for (int i = 10; i < 18; i++) {
        for (int x = 0; x < 10; x++) {
            Log.info("Reading (A%d): %ld", i-10, analogRead(i));
            delay(1000);
        }
    }
}
void loop() {
}

---

Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)