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

This reverts commit 3256901e.

Reason for revert: Likely culprit for b/327606846. Will be running through ABTD for confirmation and before submitting the revert. 

Change-Id: I7332c0350413f9a2552df92ca2d5f7f4eb2bb2b3

AconfigFlags.bp

@@ -310,8 +310,6 @@ java_aconfig_library {
 aconfig_declarations {
     name: "android.os.flags-aconfig",
     package: "android.os",
-    exportable: true,
-    container: "system",
     srcs: ["core/java/android/os/*.aconfig"],
 }
 
@@ -328,13 +326,6 @@ java_aconfig_library {
     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",

core/java/android/os/flags.aconfig

 package: "android.os"
-container: "system"
 
 flag {
     name: "android_os_build_vanilla_ice_cream"
@@ -41,7 +40,6 @@ flag {
     namespace: "profile_experiences"
     description: "Guards a new Private Profile type in UserManager - everything from its setup to config to deletion."
     bug: "299069460"
-    is_exported: true
 }
 
 flag {