Dependency inversion

[erhankur]

Dependency inverted as common to target. Now flow will be like this:

Entry Point (src/)
    ↓
Common (generic target implementations with weak functions)
    ↓
Target (overridden weak functions for target specific implementations)
    ↓
Base (interface headers only serves both common and target)

Common code can now use target specific headers like <soc/soc.h> to implement generic functions once instead of duplicating across 13+ targets

[github-actions]

	Messages
📖	This PR seems to be quite large (total lines of code: 1516), you might consider splitting it into smaller PRs

👋 Hello erhankur, we appreciate your contribution to this project!

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[dobairoland]

LGTM

[Dzarda7]

LGTM, thanks, left one comment. This is what I had in mind, we can also limit some supported functions by using target capabilities without adding circular dependency now IIUC, still would like to avoid ifdefs, but it is possible.

[antmak]

This structure looks good!

Sorry for nit-picking, just to get better README. Which the three layers do you mean? I found lists with 4 items.

[erhankur]

This structure looks good!

Sorry for nit-picking, just to get better README. Which the three layers do you mean? I found lists with 4 items.

Base is not a physical layer. Interface for common and target.

srs --> common --> target
           |         |
         base       base

Readme is updated to clarify private folder purpose.

[erhankur]

Thanks everyone for reviews.