Revert^2 "Create exported mode flag library for package android.os"

This reverts commit 147da27572066981747299fcdd46d6ccf3040a1c.

Reason for revert: The original issue has been fixed

Change-Id: I445d8e8fecc1fead739847c756cfba66a384c978
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 2047168..eed248b 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -310,6 +310,8 @@
 aconfig_declarations {
     name: "android.os.flags-aconfig",
     package: "android.os",
+    exportable: true,
+    container: "system",
     srcs: ["core/java/android/os/*.aconfig"],
 }
 
@@ -326,6 +328,13 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+java_aconfig_library {
+    name: "android.os.flags-aconfig-java-export",
+    aconfig_declarations: "android.os.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+    mode: "exported",
+}
+
 // VirtualDeviceManager
 cc_aconfig_library {
     name: "android.companion.virtualdevice.flags-aconfig-cc",