cros_ca: Add numpy package to cros_ca python automation

Add numpy package to support computing of percentile

BUG=b:349835887
TEST=cros local test: python bin/test_cros_remote.py --var=duration=2 <DUT> cuj.VideoPlaying

Change-Id: I5e37588fe130190711c450bd9d03017be3b0568b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/5664035
Reviewed-by: Xibin Liu <xibin@google.com>
Commit-Queue: Willis Kung <williskung@google.com>
Tested-by: Willis Kung <williskung@google.com>
Auto-Submit: Willis Kung <williskung@google.com>
2 files changed