boards: add thingy91x board

[maxd-nordic]

This patch adds board files for the Thingy:91 X.

The required changes to Zephyr and MCUBoot have been merged!
We're ready to go!

[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite
test-fw-nrfconnect-boot	X
test-fw-nrfconnect-fw-update	X
test-sdk-wifi	X

Detailed information of selected test modules

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

[maxd-nordic]

Note: We have to make sure to make a distinction between PCA20064 and PCA20065 (newer version that is planned to be the main release).

[maxd-nordic]

PRs that need to be handled before this can be finished:
nrfconnect/sdk-mcuboot#291
zephyrproject-rtos/zephyr#63395
zephyrproject-rtos/zephyr#63394 (available upstream)
zephyrproject-rtos/zephyr#63162 (available upstream)
ADXL367 support https://github.com/zephyrproject-rtos/zephyr/pulls?q=is%3Apr+is%3Aclosed+adxl367 (available upstream)

[gregersrygg]

This comment is outdated. The UART trace backend now uses the Zephyr driver depending on the device tree chosen node for modem traces:

	chosen {
		nordic,modem-trace-uart = &uart1;
	};

So it depends on if we want modem traces to be enabled by default or not. It might make sense to disable by default for battery usage, and use a snippet to enable when needed. But perhaps set the default directly in thingy91x_nrf9161_common.dts? Or does it need to differ between secure/non secure?

[maxd-nordic]

changed to comment to make clear why this is disabled by default in non-secure.

[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.

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[maxd-nordic]

I decided to remove MCUBoot serial recovery from the nrf91 image since we will ship with a debugger.
This enables us to see logs of the second boot stage.

[maxd-nordic]

the zephyr fork now only contains fromtree commits! Only need to update Zephyr (and add stuff to mcuboot) for basic support of the device now.

[NordicBuilder]

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

Name	Old Revision	New Revision	Diff
mcuboot	nrfconnect/sdk-mcuboot@beebb23 (upmerge-tmp)	nrfconnect/sdk-mcuboot#294	nrfconnect/sdk-mcuboot#294/files

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[maxd-nordic]

rebased an squashed - ready from my point of view

[maxd-nordic]

touched up the headers to make sure license remarks are present and consistent

[balaji-srin]

Verified by building and testing samples on both 9151 and 5340 chip.