Remove error.TestNAError

Replaced with logging.info.  The result will be the test will be green
or red on the dashboard.

BUG=chromium:399452
TEST=None

Change-Id: I7d4857af503281197a1cda6714e26699ccc4e11c
(cherry picked from commit 5a344a01cd602a900913ff378079773ba20be3de)
Reviewed-on: https://chromium-review.googlesource.com/210701
Tested-by: Kris Rambish <krisr@chromium.org>
Reviewed-by: Kris Rambish <krisr@chromium.org>
diff --git a/client/site_tests/hardware_StorageWearoutDetect/hardware_StorageWearoutDetect.py b/client/site_tests/hardware_StorageWearoutDetect/hardware_StorageWearoutDetect.py
index a64d5e6..7806109 100644
--- a/client/site_tests/hardware_StorageWearoutDetect/hardware_StorageWearoutDetect.py
+++ b/client/site_tests/hardware_StorageWearoutDetect/hardware_StorageWearoutDetect.py
@@ -104,4 +104,4 @@
         if legacy_mmc:
             msg = 'eMMC version %s detected. ' % version
             msg += 'Wearout attributes are supported in eMMC 5.0 and later.'
-            raise error.TestNAError(msg)
+            logging.info(msg)