[PATCH][Newlib][AArch32] Fix the build for M class semihosting

[Tamar Christina]

Hi All,

The M class cores don't support Semihosting v2 mixed mode, but we were
accidentally using the new immediates for it.  My last patch changed the
immediates which broke the build because doing a full multi-lib build
including M architectures now results in an assembler error instead of
silently doing the wrong thing.

This fixes the issue by changing the defines around such that According
to the specs any M class build uses the normal semihosting instructions
always.

Regtested on arm-none-eabi and no issues, using a build with m class
multilibs too.

Ok for master?

PS, I don't have commit rights so if OK can someone commit for me?

Thanks,
Tamar
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