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mtspr to CFAR is currently a no-op, which is not what should happen.
Make it set the contents of CFAR.
Also provide access to CFAR via the DMI debug interface as register 0x31.
Fixes: c2da82764f ("core: Implement CFAR register", 2020-06-15)
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>