cpufreq: interactive: Ignore hispeed_freq logic for notification

When governor gets a notification from scheduler, scheduler provides
exact load that is required by the workload. Ignore hispeed_freq logic
and directly use choose_freq result for notifications.

Also use is_notif field to distinguish notifications instead of
MAX_LOCAL_LOAD.

Change-Id: I409ea66c00f4277adf32d18c339631e1a8b0f97b
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>