Fix/nrf52 i2c hang (#1108)
Fix/nrf52 i2c hang (#1108)

* Workaround for TWI hang which can occur when slave exhibits bad behavior on the bus
* Revise fix and comments for better clarity

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core