The lpc23xx MCU has up to three I2C interfaces.
This adds a driver for it.
The peripheral works in interrupt mode, each change of the state machine
will generate an interrupt.
The response to the states are laid out in the data sheet.
This replaces the old driver that was removed in c560e28eb69000b9c68b4b6210aae271a9d8b622
937c954d92