Create a pr for micropython that enables the default I2C bus to be used if no parameters provided.

[gigapod]

Update micropython and submit a PR so that the default i2c bus is used if no value is passed when creating an I2C bus object.

This removes the need for the i2c driver needed to know what bus to use for a specific board - just use the default which is specified for the board (at least with the rp2 builds).

This should be investigated for the following micropython platfomrs/ports:

• rp2 (raspberry pi) #392
• ESP32 #393

[malcolm-sparkfun]

Pull Request Submitted Here: micropython/micropython#16671. Tested against Pico W and Thing Plus. All CI/CD checks passing.