cpufreq: schedutil: Don't jump to max frequency for RT tasks

Android uses a lot of RT threads. Jumping to max frequency for RT tasks
will cause a significant degradation in power that would not be acceptable
for mobile devices. So, stop doing that.

Change-Id: I4e1056c678755014e38eaafe05e890ff2e38c42e
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>