Patch for GIGA I2C quirk

[caternuson]

This is a simple patch to get around this issue from the Arduino mbed OS core used by the GIGA R1:
arduino/ArduinoCore-mbed#414

Some devices will NACK the read attempt, which is equivalent to "not found".

This patch tricks the BSP logic and forces it to use a write request instead of a read request.

Example test case GIGA R1 connected to an Adafruit Arcade 1x4 Button breakout and running the example from Learn guide:
https://learn.adafruit.com/adafruit-led-arcade-button-qt/arduino

BEFORE

AFTER

Thanks to @silvan2468 for suggesting this fix here:
adafruit/Adafruit_Seesaw#84

[caternuson]

@ladyada for review

[ladyada]

ez pz