cmd: ufetch: Show CPU architecture under "CPU"

cmd: ufetch: Show CPU architecture under "CPU"

When looking at ufetch output it isn't immediately obvious which CPU
architecture the presented board has. This patch therefore adds the
CPU architecture string (for example "powerpc") to the "CPU:" line.
The new format is:

	CPU: powerpc (1 cores, 1 in use)

Signed-off-by: J. Neuschäfer <j.ne@posteo.net>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20241211-ufetch-v2-3-2b5432ffaeb1@posteo.net
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>