Brought Cortex-A34 and the A78 SMP port under the ARMv8-A generator (#599)

ports/cortex_a34, ports_smp/cortex_a34_smp and ports_smp/cortex_a78_smp were
absent from the ARMv8-A generator's core list, so ports_arch never reached them
and scripts/check_ports.sh could not detect that they had drifted. They had.

The two Cortex-A34 ports sat two releases behind the shared sources, at 6.1.10
against 6.3.0. The difference is not only banners: tx_initialize_low_level.S
lacked the SUB x1, x1, #15 that precedes the BIC when the system stack pointer
is recorded, so the value stored was the incoming SP rather than the first
16-byte boundary below it. The Arm Development Studio example was missing
GICv3_aliases.h, which every other port's GICv3_gicc.h includes to reach the
interrupt controller registers through the stringify indirection.

The Cortex-A78 SMP port had never had its debug launch configuration patched at
all. It still named the A35 platform and model, so Debug Cortex-A35,
Base_A35x4 and FVP_Base_Cortex-A35x4 would have started an A35 model for an A78
port.

Add cortex_a34 to the core list. Cortex-A78 cannot go in the same list, because
the generator walks cores against port sets and would then create a
ports/cortex_a78 that the tree has never had; give it a separate SMP-only list
consulted only for the tx_smp port set. Both changes are mirrored in update.ps1,
which stays equivalent to update.sh.

Verified by regenerating: exactly these three port directories change, 116 files
modified and 13 added, and no already-covered core moves, so the core list was
the only thing holding them back. scripts/check_ports.sh passes, which now means
these three are checked for reproducibility for the first time.
scripts/check_clang.sh reports 38 of 38 example builds linked, the three new
ports included.

readme_threadx.txt is not added here. Only the two Cortex-A35 template ports
carry it; the other 23 AArch64 ports do not, so its absence from Cortex-A34 is
the tree's norm rather than drift, and supplying it everywhere is separate work.

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

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