fix/datanocopy: add section to hold boot related variables

[danielRep]

This PR replaces the pad_load output section for a datanocopy section that has two goals:

• Hold data to be initialized and used during early stages of the boot (e.g., barriers, img_addr) that can be rewritten in non-unified platforms, since data is typically copied from a non-volatile memory to a data RAM
• Force the alignment in the end of the section to ensure the loadable portion of the image is page-aligned to avoid gaps. These gaps have seen to create issues on platforms such as Tricore.

[josecm]

@danielRep are we sure aarch64 and riscv boot does not require this either?

[danielRep]

@danielRep are we sure aarch64 and riscv boot does not require this either?

I think we should create a PR adding those changes as soon as we have platforms to test it, no?

[josecm]

@danielRep are we sure aarch64 and riscv boot does not require this either?

I think we should create a PR adding those changes as soon as we have platforms to test it, no?

I think we can just check data sections written during boot and move them to datanocopy