[nrf noup] cmake: nrf54l: iar: fix cmake linker generator for kmu

[RobinKastberg]

This adds the required parts for nrf54l kmu in
cmake linker generator.

[NordicBuilder]

none

Note: This comment is automatically posted and updated by the Contribs GitHub Action.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[carlescufi]

@RobinKastberg if this is not applicable upstream, can you please prefix the commit message with [nrf noup]? More info here:

https://ncsdoc.z6.web.core.windows.net/latest/nrf/dev_model_and_contributions/code_base.html#oss-repositories-downstream-project-history

You can also git log to get an idea of how it works.

[Vge0rge]

I tested this (with gcc only) and it seems to work ok.

One small note, please add this line inside the commit message after the title:
nrf-squash! [nrf noup] soc: nrf54l: Add custom section for KMU

You can see how this commit does it here:
8feaa71

Also a second note is that this logic will be removed in the figure and a pure dts solution will be used. Just sharing this here FYI.

Add the commit text that I asked for and I will approve this.

[RobinKastberg]

How about now?