Removed the vector table offset register and system stack pointer setup from the Cortex-M low-level initialization (#714)

_tx_initialize_low_level wrote VTOR and derived _tx_thread_system_stack_ptr from
the reset vector on every Cortex-M port. Programming VTOR is the job of the
low-level startup code that runs before the kernel is entered, and doing it again
inside ThreadX silently overrode a vector table that the application, a
bootloader or a firmware update had already installed. It also forced every
application to export a vector table symbol that the kernel itself never needed.

_tx_thread_system_stack_ptr is never read by any Cortex-M port, so the value
copied out of the reset vector served no purpose.

Both blocks are removed from all Cortex-M ports, together with the now-unused
symbol declarations. The GreenHills files keep the NVIC base address load that
the removed block used to leave in r0 for the SysTick setup that follows.

Applications that relied on ThreadX programming VTOR must now set it in their
startup code. The bundled examples link their vector table at address zero and
run on the reset default.

Fixes #370

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

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