UPSTREAM: cpufreq: schedutil: Pass sg_policy to get_next_freq()

get_next_freq() uses sg_cpu only to get sg_policy, which the callers of
get_next_freq() already have. Pass sg_policy instead of sg_cpu to
get_next_freq(), to make it more efficient.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 655cb1ebff4b7918fc560502c3297af2d3c7d114)
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Change-Id: Ia210058da32930a6cdb18258aa679cd1a44a747e
Signed-off-by: Quentin Perret <quentin.perret@arm.com>