Add first aconfig library inside the framework.

The difficult part here is that the aconfig libraries can't be compiled
separately from the framework, so the framework adds a srcjar and we add
a fake DeviceConfig so that the generated libraries will compile.

Bug: 293195086
Test: m
Change-Id: Ia54cb5d1196f9579f418586a0c53b8846d46dc5a
diff --git a/Android.bp b/Android.bp
index 94bcb3e..274c430 100644
--- a/Android.bp
+++ b/Android.bp
@@ -263,6 +263,7 @@
     defaults: [
         "framework-aidl-export-defaults",
         "latest_android_hardware_soundtrigger3_java_static",
+        "framework-minus-apex-aconfig-libraries",
     ],
     srcs: [
         ":framework-non-updatable-sources",
@@ -611,6 +612,7 @@
 }
 
 build = [
+    "AconfigFlags.bp",
     "ProtoLibraries.bp",
     "TestProtoLibraries.bp",
 ]