The original data model definition assumed data from a quad-core CPU,
which caused errors with single- and dual-core processors.
Adjust the data model to work with also them.
Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Add support for 'cpufreq' plugin in collectd, which monitors
the CPU cores' frequencies. Some platforms enable dynamic
frequency scaling according to CPU load.
'cpufreq' plugin can currently be built for x86 and mvebu.
(and it should likely be enabled also for ipq806x)
Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>