Remove unnecessary CMake target indirection

[mbolivar]

Is your enhancement proposal related to a problem? Please describe.

As prep work for #13672, various changes were made to the build system which add extra layers of indirection for target names. One example commit is 1b86fb9.

Since this PR was rejected, the indirection is not necessary and will not be necessary, so it should be removed.

I'm not sure if any other indirection besides targets should be looked at.

Describe the solution you'd like

Remove extra indirection and refer to target names directly from CMake, e.g. offsets_h instead of ${OFFSETS_H_TARGET}.

[mbolivar]

FYI @carlescufi @SebastianBoe @tejlmand @hakonfam

I'm not sure about the milestone, but this should be done "eventually".

[SebastianBoe]

Agreed

[tejlmand]

agreed/

[zephyrbot]

Hi @tejlmand,

This issue, marked as an Enhancement, was opened a while ago and did not get any traction. It was just assigned to you based on the labels. If you don't consider yourself the right person to address this issue, please re-assing it to the right person.

Please take a moment to review if the issue is still relevant to the project. If it is, please provide feedback and direction on how to move forward. If it is not, has already been addressed, is a duplicate, or is no longer relevant, please close it with a short comment explaining the reason.

@mbolivar you are also encouraged to help moving this issue forward by providing additional information and confirming this request/issue is still relevant to you.

Thanks!