457: nrf91: support running in both S and NS mode. r=Dirbaio a=Dirbaio
- Cargo feature `nrf9160` is now `nrf9160-s` or `nrf9160-ns`
- "fake-PAC" renames everything appropriately so there's no need to spam cfg's everywhere.
With `nrf9160-s` you can now run code without flashing any weird SPM/bootloader. Tested on nrf9160-dk.
Co-authored-by: Dario Nieuwenhuis <dirbaio@dirbaio.net>
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