Added ARMv7-A SMP Linux build scripts(A5,A7,A9) (#674)

* ports: add Linux build scripts for Cortex-A5 SMP

* ports: fix Cortex-A5 SMP sample linking on Linux

* ports: add Linux build scripts for Cortex-A7 and A9 SMP

* ports: fix Cortex-A7 SMP assembly source path

* wip: add ATFE selection to Armv7 SMP scripts

* ports: complete Armv7 SMP Linux toolchain support

* ports: add local startup for Armv7 SMP samples

* ports: add license headers to Armv7 SMP scripts

* Dropped the preprocessing flag the file extension now carries

Two lines named assembly sources that #672 renamed. That change moved
twenty-nine files under gnu trees from .s to .S, because GAS runs the C
preprocessor on .S and not on .s: in a .s file every # line is a comment, so a
#define is never substituted and an #if/#else pair emits both arms. Four files
were silently doing the wrong thing as a result, including
ports_smp/cortex_a7_smp/gnu/src/tx_thread_smp_unprotect.s, which ignored all
four of its own feature macros.

These scripts had worked around the same defect with -x assembler-with-cpp
rather than hitting it, which was correct when they were written. With the
rename the flag is redundant and the lowercase names no longer resolve, so
cortex_a5_smp/build_threadx.sh failed with "cc1: fatal error:
tx_initialize_low_level.s: No such file or directory". The other seven
references to those two files across these three scripts already named them
with a capital S.

Verified with the pinned Arm GNU 14.3.rel1 rather than the 13.2 that a distro
package supplies: build_threadx.sh and build_threadx_sample.sh both succeed for
a5, a7 and a9, all three link a sample_threadx.out, and scripts/check_gcc.sh
passes end to end with its example stage reading 45 of 45, up from 42.

Assisted-by: Claude Opus 5 <[email protected]>

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Co-authored-by: Frédéric Desbiens <[email protected]>

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