TODO-863: allowing EEPROM ops to complete synchronously
TODO-863: allowing EEPROM ops to complete synchronously

Ensure that there is no further weork to be done before
one of the erase/write routines returns,
to ensure that the operation is not sabotaged
by, for example, the device going to sleep.
DamonHD/OTRadioLink,DamonHD/OTRadioLink,Denzo77/OTRadioLink,Denzo77/OTRadioLink,opentrv/OTRadioLink,Denzo77/OTRadioLink,Denzo77/OTRadioLink,opentrv/OTRadioLink,DamonHD/OTRadioLink,opentrv/OTRadioLink,opentrv/OTRadioLink,DamonHD/OTRadioLink