Use class_init functions to initialize the VR in preparation for
overriding v32+ behavior there.
Move cpu_cris_init() to cpu.c and hook up a class_by_name callback.
This change leads to unknown -cpu model names no longer falling back
to a CPU with VR 32 but instead returning NULL.
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
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