odin: makefile: fix parallel build

[tgorochowik]

This PR fixes the Makefile for Odin to allow parallel builds (e.g. make -j$(nproc))

Description

There were two issues with the way the targets are defined.

1. The .%.build target cannot depend on both clean and _init. It works
   fine with a single-core build, but when executing it in parallel, the
   clean target breaks the _init target. To make it work in parallel the
   _init target now directly depends on the clean target.

2. The _set_<xxx> targets have to be executed before the _build_it
   target - they cannot be executed at the same time. This has been
   reworked to use a dynamically defined targets to avoid creating an extra
   wrapper target for each of them.

Motivation and Context

To be able to build Odin using multiple cores.

How Has This Been Tested?

Both mutli and single job builds work for Odin.

Types of changes

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[jeanlego]

looks good to me :)

thanks for this!