cpufreq: interactive: sync freq feature for interactive governor

1) Add load info to cpufreq_interactive_cpuinfo
2) If load on any other online cpu exceeds sync_freq_load_threshold, do not allow the frequency to drop below sync_freq

Change-Id: I3617e10f87b85178914a18bcf04ac2a31a4f1ec1
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
(cherry picked from commit c26e25944543c61b34b1830938bb6f353a2580ac)