Musca B1/S1: memory layout headers out of date

[LDong-Arm]

Description of defect

The headers flash_layout.h and region_defs.h for TF-M targets are directly imported from the trusted-firmware-m repository and should be upgraded along with TF-M. But they are currently one version behind (v1.2 instead of v1.3) for Musca B1 and two versions behind (v1.1) for Musca S1 in Mbed OS. The TF-M project has already changed parts of the layout.

It happened, because both files are not covered by the mbed-os-tf-m-regression-test's import script. We left them out because of a workaround for the passing of the BL2 macro to ARMC6, as explain in 0ccf4db.

So we need to update those files to those from the latest release (TF-M v1.3 at the time of writing). It would be better to find a permanent solution to not need the BL2 workaround, so we can add them to the import script.

Target(s) affected by this defect ?

ARM_MUSCA_S1
ARM_MUSCA_B1

Toolchain(s) (name and version) displaying this defect ?

N/A

What version of Mbed-os are you using (tag or sha) ?

mbed-os-6.11.0

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

N/A

How is this defect reproduced ?

Check the git histories of the files (linked above).

[hazzlim]

Permanent solution (passing macros to armlink using --predefine="<MACRO>") requires changes to frozen /tools.
This can be picked up following TF-M v1.4.0 upgrade, at which point BL2 macro workaround will need to be added to upgraded headers.

[LDong-Arm]

Even though the BL2 workaround is still needed because of frozen tools, I think there's a better one.
Hardcoding it in region_defs.h prevents us from using our automated script to import this from from the trusted-firmware-m repo, which is why the headers became outdated. We should instead hardcode this macro in linker scripts that include this header, allowing the header itself to be unmodified and automatically importable. The linker scripts themselves are specific to Mbed OS only and permanent.

Anyway, we'll make this change during the TF-M v1.4.0 upgrade.