Programming DK with Smart Remote 3 for nRF52 firmware

To use the DK add-on, the nRF52 DK must first be programmed with the firmware. The product example is preprogrammed and does not need any programming to get started.

1. Connect the nRF52 DK with DK add-on attached to a computer with a USB cable.
2. See Firmware update of Smart Remote 3 for details on firmware update.