Add aconfig flag for wearable hotword

Merging the flags first allows us to promote them to staging before the
feature code is merged, which in turn allows the tests gated by these
flags to be run as part of the feature CL's presubmit when the feature
and tests are submitted together in the same topic.

Test: Will rely on presubmit
Bug: 310055381
Change-Id: Ie1248eb3c4844922d5656d4f49e290c8f0243442
diff --git a/core/java/android/app/wearable/flags.aconfig b/core/java/android/app/wearable/flags.aconfig
index 7b2cc5e..5e8bdb5 100644
--- a/core/java/android/app/wearable/flags.aconfig
+++ b/core/java/android/app/wearable/flags.aconfig
@@ -19,4 +19,11 @@
     namespace: "machine_learning"
     description: "This flag enables the WearableSensingManager#provideWearableConnection API."
     bug: "301427767"
+}
+
+flag {
+    name: "enable_hotword_wearable_sensing_api"
+    namespace: "machine_learning"
+    description: "This flag enables the APIs related to hotword in WearableSensingManager and WearableSensingService."
+    bug: "310055381"
 }
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