btf: improve BTF types validation

[tixxdz]

When we perform BTF types validation, for some types we return the type name instead of the complete definition as this goes through the BTF process.

Example: To match "struct perf_event *" through BTF we can just do "perf_event"

This will silence the following warnings: msg="Kprobe spec pre-validation failed, but will continue with loading" error="validate argument 0 failed: type (perf_event) does not match spec type (perf_event)\n"

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[kkourt]

@tixxdz do you plan to work in this PR or should we close it?

[tixxdz]

@tixxdz do you plan to work in this PR or should we close it?

Will fix the comments and push, I just hit this over the cred object, need to find little time

[kkourt]

@tixxdz do you plan to work in this PR or should we close it?

Will fix the comments and push, I just hit this over the cred object, need to find little time

Sounds good, thanks! Feel free to make PRs as draft if you do not plan to work on them for the foreseeable future.