cheets_GTS: Update with a new waiver.

The test will be fixed in GTS 7.0r1. Until then, the failure can be ignored.

BUG=b:128872529
TEST=cheets_GTS.6.0_r4.GtsApp

Change-Id: I7c47cd841c2f6e37bb52ab0d783e7e4bde778e86
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1564329
Tested-by: Kazuhiro Inaba <kinaba@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
(cherry picked from commit a93f0813cae8b8c611bd181be0e861ef90d6b76d)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1567706
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
diff --git a/server/site_tests/cheets_GTS/expectations/waivers.yaml b/server/site_tests/cheets_GTS/expectations/waivers.yaml
index 7add2c3..8783bf2 100644
--- a/server/site_tests/cheets_GTS/expectations/waivers.yaml
+++ b/server/site_tests/cheets_GTS/expectations/waivers.yaml
@@ -3,6 +3,7 @@
 com.google.android.assistant.gts.AssistantTest#testAssistantTakePhotoWithoutVoiceInteraction: [all]
 com.google.android.assistant.gts.AssistantTest#testAssistantTakeSelfieWithoutVoiceInteraction: [all]
 com.google.android.gts.audio.AudioHostTest#testFocusChangeMediaToGuidance: [P]
+com.google.android.gts.playstore.ActivityManagerHostTest#testActivityManager: [P]
 com.google.android.placement.gts.CoreGmsAppsTest#testCoreGmsAppsPreloaded: [all]
 com.google.android.placement.gts.CoreGmsAppsTest#testGoogleDuoPreloaded: [all]
 com.google.android.placement.gts.UiPlacementTest#testPlayStore: [all]