[TF-M] [Notification] The patches about dual-core building is going to be merged

Hi, The patches for supporting dual-core building is going to be merged into 'master' branch. These patches has gone through couple rounds of reviews, if you have some final comments this would be the last chance: https://review.trustedfirmware.org/q/topic:%2522twincpu-build-enhance%2522+b...

Any feedback out of code review can reply in this mailing thread or related issue linker: https://developer.trustedfirmware.org/T467

Thanks.

/Ken