sched: WALT: increase WALT minimum window size to 20ms

Increase WALT minimum window size to 20ms.  10ms isn't large enough
capture workload's pattern.

Change-Id: I4d69577fbfeac2bc23db4ff414939cc51ada30d6
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
1 file changed