This commit adds initial support for non secure nRF7120 targets in
zephyr.
There are important limitations, such as:
- The hardware Crypto accelerator is not supported and thus the non
secure target is NOT secure for production applications in upstream
Zephyr.
- The BL2 is not supported, so no DFU is supported with this support
Signed-off-by: Robert Robinson <robert.robinson@nordicsemi.no>