crosperf: make default iterations of benchmarks >= 2

So as to get standard deviations, which are needed in ttest for p-value.

TEST=none
BUG=none

Change-Id: If59fb46b62c0cb58610507962f8ca13ccc0b7d01
Reviewed-on: https://chromium-review.googlesource.com/452796
Commit-Ready: Ting-Yuan Huang <laszio@chromium.org>
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed