nRF51 doesn't have any sort of flash page cache so we need to write
all of the data on the word-by-word basis and poll for "Flash Ready"
bit each time.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Change-Id: I8caffbf69ebf9a69915724704ddbe270d1bb8d92
Reviewed-on: http://openocd.zylin.com/2050
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>