[PATCH v3] smpfatal08: halt secondary processors if necessary

[Jiri Gaisler]

> Just one nit, I think we still want to keep
> -  (void) cpu_self;
> because the variable is unused. This suppresses unused variable warnings.
I never understood why it was there, but now I know ... :-)

smpfatal08 fails on systems where all cpus are started by the 
boot-loader and thereby clobber the test output. This patch stops the 
secondary cpus with a call to _CPU_Thread_Idle_body(). Tested on RISC-V 
and SPARC.

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