MFC r358555, r358799-r358800
cpufreq_dt: Improve multiple opp support
When looking for cpu with the same OPP starts from the root /cpus node
so each instance of cpufreq_dt will now each cpu with the same operating
Also test that the node we are testing have the property "device_type" set
to be equal to "cpu".
While here add more debug printfs (off by defaults).
cpufreq_dt: Fix r358555
Before skipping the current cpu when trying to find the ones that
have the same opp, record that this one have this opp.
Reported by: mmel
cpufreq: Unbreak build.