boards: nrf53: config EXTDOMAIN in soc to reduce code duplication

[SebastianBoe]

Configure the "cpunet" to be secure from the soc system initialization to avoid code duplication across all the boards.

cpunet is now configured to be secure earlier in the boot process, from POST_KERNEL to PRE_KERNEL, but AFAIK this is not a problem.

[NordicBuilder]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
zephyr	nrfconnect/sdk-zephyr@a1769ab (main)	nrfconnect/sdk-zephyr#1749	nrfconnect/sdk-zephyr#1749/files

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite
desktop52_verification	X
test-fw-nrfconnect-ble	X
test-fw-nrfconnect-ble_samples	X
test-fw-nrfconnect-fem	X
test-fw-nrfconnect-nfc	X
test-fw-nrfconnect-nrf_crypto	X
test-fw-nrfconnect-rpc	X
test-fw-nrfconnect-rs	X
test-fw-nrfconnect-tfm	X
test-low-level	X
test-sdk-audio	X
test-sdk-find-my	X

Detailed information of selected test modules

Note: This message is automatically posted and updated by the CI

[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

Note: This comment is automatically posted by the Documentation Publishing GitHub Action.

[SebastianBoe]

no test results yet because the BLE test plan is red on master.

Waiting for BLE to fix their test plan.

[github-actions]

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