FAFT: increased power state retry count for firmware_ECLidShutdown

Increased POWER_STATE_CHECK_TRIES from 1 to 3 to allow for multiple
tries when checking power state after closing the lid.

BUG=b:159944771
TEST=Verified test passes on eve and nami devices.

Change-Id: I63ade50ff391ab01f18d2d108e8b50507c0292ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2333437
Tested-by: Brent Peterson <brentpeterson@chromium.org>
Reviewed-by: Philip Chen <philipchen@chromium.org>
Commit-Queue: Brent Peterson <brentpeterson@chromium.org>
diff --git a/server/site_tests/firmware_ECLidShutdown/firmware_ECLidShutdown.py b/server/site_tests/firmware_ECLidShutdown/firmware_ECLidShutdown.py
index b3b3667..0eb75ca 100644
--- a/server/site_tests/firmware_ECLidShutdown/firmware_ECLidShutdown.py
+++ b/server/site_tests/firmware_ECLidShutdown/firmware_ECLidShutdown.py
@@ -20,7 +20,7 @@
     # Delay to allow for a power state change after closing or opening the lid.
     # This value is determined experimentally.
     LID_POWER_STATE_DELAY = 5
-    POWER_STATE_CHECK_TRIES = 1
+    POWER_STATE_CHECK_TRIES = 3
     IGNORE_LID_IN_USERSPACE_CMD = 'echo 0 > /var/lib/power_manager/use_lid'
     CHECK_POWER_MANAGER_CFG_DEFAULT = '[ ! -f /var/lib/power_manager/use_lid ]'