The API is deprecated as it was decided to build in the flash protection
service into write and erase procedures.
This is solution chosen for fix following issue:
When two or more threads writes to flash device it is
possible that flash protection will be enabled by one of
threads despite another thread(s) still needs it disabled.
fixes#3127
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
