lib/powerpc: Add function to start secondary threads

Add the lib/powerpc/smp.c file and associated header files as a place
to implement generic smp functionality for inclusion in tests.

Add functio

lib/powerpc: Add function to start secondary threads

Add the lib/powerpc/smp.c file and associated header files as a place
to implement generic smp functionality for inclusion in tests.

Add functions start_all_cpus(), start_cpu() and start_thread() to start
all stopped threads of all cpus, all stopped threads of a single cpu or a
single stopped thread of a guest at a given execution location,
respectively.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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