porting API for architecture-native image startup address check

[nvlsianpu]

https://github.com/mcu-tools/mcuboot/pull/1206 introduces check which is working for ARM cores

Rationale: isolate architecture specific code from mcuboot's core code, of which kind loader.c should be.

Objective: Introduce interface API which will be for check whether application startup address belongs to the primary slot flash area.

Refine check implementation for ARM. Empty implementation for others cores.

[d3zd3z]

I think there are multiple opportunities to do this within the code (not that we shouldn't do this one), our code has become fairly ifdef heavy, and I think there are enough of them sprinkled throughout the code that it seems like the obvious way to add a new feature. Ones to start with are ones like this, where the ifdefs are in the middle of blocks of code (the multi image stuff has a lot of these).

[github-actions[bot]]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.

[d3zd3z]

Removing the stale, as I think we do want to do this.

[github-actions[bot]]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.