Add feature flag for early-screen-timeout-detector

Bug: 261744687

Test: adbt build
Change-Id: I305bfe0363a93f0685d5976b3c156227f644ae33
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index edd9d3a..ce311d0 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -73,6 +73,7 @@
     ":android.provider.flags-aconfig-java{.generated_srcjars}",
     ":android.chre.flags-aconfig-java{.generated_srcjars}",
     ":android.speech.flags-aconfig-java{.generated_srcjars}",
+    ":power_flags_lib{.generated_srcjars}",
 ]
 
 filegroup {
@@ -932,3 +933,10 @@
     aconfig_declarations: "android.speech.flags-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// Power
+java_aconfig_library {
+    name: "power_flags_lib",
+    aconfig_declarations: "power_flags",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}