[TF-M] Last call (for review) before merging linker script changes

Hi all,

I'm going to merge the following changes to common linker scripts to support dual-cpu platforms by the end of this week. https://review.trustedfirmware.org/q/topic:%22twincpu-merge-linker-script%22...) Those changes mainly focus on making it easier and more comfortable to configure Armv6-M/Armv7-M MPU on a dual-cpu platform.

As the changes touch the common linker scripts, I'm sorry if it affects your tasks in hand. Please let me know if the merging concerns you or breaks any urgent task. Thank you.

Best regards, Hu Ziji