cpufreq_interactive: Allow hispeed_freq to work with prediction

hispeed_freq can still be useful with some versions of predictive
load based scaling. So, allow that.

Change-Id: I84ce1e2b6e7e839bd278aa3deaac21f4cd8503a8
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>