Add Context Hub flags to frameworks/base

This CL adds flag for CHRE/Context Hub to frameworks/base for use
with the ContextHubService and related classes.

Bug: 312417087
Test: Presubmits
Change-Id: I8830ba4fc48db423e0e5db9dd18a5b0bf7cb89d1
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 9e30843..de1a0d7 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -71,6 +71,7 @@
     ":android.appwidget.flags-aconfig-java{.generated_srcjars}",
     ":android.webkit.flags-aconfig-java{.generated_srcjars}",
     ":android.provider.flags-aconfig-java{.generated_srcjars}",
+    ":android.chre.flags-aconfig-java{.generated_srcjars}",
 ]
 
 filegroup {
@@ -905,3 +906,10 @@
     aconfig_declarations: "android.provider.flags-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// ContextHub
+java_aconfig_library {
+    name: "android.chre.flags-aconfig-java",
+    aconfig_declarations: "chre_flags",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}