UPSTREAM: cpufreq: schedutil: move cached_raw_freq to struct sugov_policy

cached_raw_freq applies to the entire cpufreq policy and not individual
CPUs. Apart from wasting per-cpu memory, it is actually wrong to keep it
in struct sugov_cpu as we may end up comparing next_freq with a stale
cached_raw_freq of a random CPU.

Move cached_raw_freq to struct sugov_policy.

Fixes: 5cbea46984d6 (cpufreq: schedutil: map raw required frequency to driver frequency)
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry-picked from 6c4f0fa643cb9e775dcc976e3db00d649468ff1d)
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Change-Id: Ie91420f710819b383947f9031da9be1f3bb7f636