Add common hardware security support, including MPU and HSM

[aditihilbert]

HW features include, but are not limited to:

OTP memory for secure key storage
crypto accelerator
TCB (trusted computing base) e.g. ROM
isolated execution environment
device authentication - immutable base identity
execution-aware memory protection unit

This issue covers adding support for HSM to MCUboot (likely to imgtool). It will probably be needed to do some initial investigation as to what HSM to initially support. Without an economical device, we may have to leave the support simulated, with hooks, so that someone needing these devices can add the support.

[d3zd3z]

We should probably make separate issues for the ones we wish to support. I'll create one for HSM.

[github-actions]

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