[TF-M] Build system changes for dual core platforms

Hi,

Please review the proposed build system changes. Intention of those is to lay groundwork for building TFM for dual core platforms (aka twincpu). The main problem of the existing build system is that it assumes that both tfm_s and tfm_ns run on the same core. In dual core systems secure and non-secure code runs on two independent cores. Each CPU core can be different in terms of architecture, configuration etc, and this adds the requirement of separating out secure and non-secure builds.. The patches basically do the following:

* Introduce TFM_MULTI_CORE_TOPOLOGY, that distinguish single core and multicore builds. * Split secure and non-secure builds and build both in single building execution.

https://review.trustedfirmware.org/c/trusted-firmware-m/+/1747 https://review.trustedfirmware.org/c/trusted-firmware-m/+/1748 https://review.trustedfirmware.org/c/trusted-firmware-m/+/1749

Thanks, Andrei

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