CMake add source file to library build - TF-M

[Nano-HK]

Hello.

We are trying to add source files to the TF-M library build from our own module, specifically a tfm_rotpk.c file instead of the existing dummy under trusted-firmware-m/platform/ext/common/template.

I have tried to do that with CMake but have not succeded yet. If I would append source files to the TF-M build, e.g., adding local tfm_rotpk.c, how do i do that?

Regards,
Nano