Support for NRF9160DK

[Strange21]

Add support for NRF9160 board

• Enable Trustzone-M support for NRF9160 board.

• Initialize the secure and non-secure space.
• Make the transition from secure to non-secure space.
• Check for the available helper crates to manage TrustZone-M.
• Prepare a micro bootloader which initializes the secure and non-secure space, and jumps to a blinky firmware.
• Integrate the TrustZone-M support for rustBoot

• Implement the Hal flash driver for NRF9160 board

  • Search for the well maintained HAL crate for the board
  • Get the Blinky code working
  • Get the write and erase functions working on the flash
  • Integrate the write and erase functions in rust boot
  • Create the Boot and Update firmware using different LEDs
  • Integrate and Test the rustBoot project for the NRF9160 board