LEON3: use CPU_Fatal_halt for halt

By removing the bsp_reset() mechanism and instead relying on the
CPU_Fatal_halt() routine SMP and single-core can halt by updating
the _Internal_errors_What_happened structure and set the state to
SYSTEM_STATE_TERMINATED (the generic way). This will be better
for test scripts and debugger that can generically look into why
the OS stopped.

For SMP systems, only the fatal-reporting CPU waits until all other
CPUs are powered down (with a time out of one clock tick). The
reason why a fatal stop happend may be because CPU0 was soft-locked
up so we can never trust that CPU0 should do the halt for us.

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