Support for the 12-bit DAC MCP4725

[divyabhaskaran20]

What kind of new feature are you looking for?

I’m looking for hardware support for the 12-bit DAC MCP4725 over I2C and would be happy to contribute a driver for it.

• Hardware: MCP4725

Do you plan to:

• Contribute an initial driver: Yes
• Write unit tests: Yes
• Update https://github.com/periph/cmd to use the new functionality: Yes

[gsexton]

Implemented in #108