[TF-M] Musca-A platform deprecation announcement

Hello,

I would like to propose the deprecation of Musca-A platform. With whole respect to the first HW platform supported TF-M, it became quite old and difficult to access. The current plan is to remove Musca-A from support and TF-M master code in the next release v1.3.0. Please reply to this mail until Feb 16 (in 4 weeks) having any objection for deprecation.

Thanks and Best regards Anton Komlev