* Added nRF5340 driver support for Clock, Internal Flash (NVMC), GPIO, SPU, OTP, UART, SPI, QSPI and IPC.
* Added support for updating the network core (Sign using "--id 2")
* Cleanup the nRF52 port
* Improved external QSPI and internal Flash tests and logging.
* Improved internal printf support for formatter length.
- Using two sectors to keep partition/sector flags
- Keep two redundant set of flags, update one at a time
- Erase is done when the sector is old
- Flags update is faster because Erase is done in advance
- Accessing trailer information (including encryption keys) is done by
selecting the newest information
Tested via renode, using nrf52 with NVM_FLASH_WRITEONCE flag on.