Remove IAR patches from #14900

[jeromecoutant]

Summary of changes

#14900 introduces patches in IAR files, which have been never tested...

IAR build is now not possible.

I removed, then, updates to enable back IAR build support

Impact of changes

Migration actions required

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[x] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@jeromecoutant, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

What are the errors?

This pull request is reverting the files back to its previous state? That would diverge what we have. We should rather fix errors introduced.

I introduced a fix to .s files for other toolchains, we might need to apply the same for IAR or is IAR different again from gcc/armclang ? I had a problem with preprocessing the .s files.

[jeromecoutant]

Yes better patch is to correct the new files.
But don't have this time.... so this PR can be seen as a quick workaround

[jeromecoutant]

What are the errors?

Not very explicit error... Example with DISCO_L475VG_IOT01A:

Compile [  0.1%]: irq_cm4f.S
[DEBUG] Return: 3

[0xc0170]

As I resolved these files recently, I'll find time to check the errors and clear them.

[0xc0170]

The error comes from #include ".rtx_defh" - we do not pass include paths to iarasm :/ I'll send a fix via new PR. I'll close this one.