Skip CompressCheckerboard unit test on N6.

This is at least one of the failures making the bot red.
The particular signal indicates it's probably an alignment problem.

BUG=skia:5637
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2245063002

CQ_INCLUDE_TRYBOTS=master.client.skia.android:Test-Android-GCC-Nexus6-CPU-NEON-Arm7-Debug-Trybot

TBR=robertphillips@google.com

Review-Url: https://codereview.chromium.org/2245063002
2 files changed