fix(bootloader_support): Add missing C linkage to some headers (IDFGH-12930)

[andylinpersonal]

I'm developing some bootloader hooks in C++ and just found some headers lack extern "C" {} guard.
This issue can also be found in release/v5.3 and master.

[github-actions]

	Fails
🚫	The target branch for this pull request should be `master`. If you would like to add this feature to the release branch, please state this in the PR description and we will consider backporting it.

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[KonstantinKondrashov]

Hi @andylinpersonal!
Seems like we can take these changes to master. Backports will not be created though because it is not a critical issue.
I see that you made some changes. Is it the final version?
Have you achieved your goal with these changes? Ok, anyway I will check the rest bootloader headers if it is needed there as well.

[andylinpersonal]

Oh it's the final version. I've just removed some accidentally re-formatted code.

[andylinpersonal]

Fixed in 788455f