silabs: new gpio driver is broken when mcuboot bootloader is used

[loopj]

Describe the bug

SiLabs GPIO driver no longer seems to work when using mcuboot.

This was introduced in #92824. Checking out a91b959 (the commit before this PR was merged) everything works as expected.

Regression

• This is a regression.

Steps to reproduce

Here is a minimal reproduction case:
https://github.com/loopj/silabs-gpio-repro

When building with mcuboot (--sysbuild) the callback is never called in response to the button press.
When building without mcuboot (no --sysbuild) the callback is called as expected.

Relevant log output

Impact

Major – Severely degrades functionality; workaround is difficult or unavailable.

Environment

No response

Additional Context

No response