make java reader library availiable for mainline

Test: atest aconfig.test.java
Bug: 349874828
Change-Id: I2cabfa9665e5c474ba64f5969e96e9dae2fdcb9b

tools/aconfig/aconfig_storage_file/Android.bp

@@ -145,4 +145,10 @@ java_library {
         "srcs/**/*.java",
     ],
     sdk_version: "core_current",
+    min_sdk_version: "29",
+    host_supported: true,
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
 }

tools/aconfig/aconfig_storage_read_api/Android.bp

@@ -175,4 +175,10 @@ java_library {
         "aconfig_storage_file_java",
     ],
     sdk_version: "core_current",
+    host_supported: true,
+    min_sdk_version: "29",
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
 }

tools/aconfig/fake_device_config/src/android/provider/Log.java

@@ -0,0 +1,15 @@
+package android.util;
+
+public final class Log {
+    public static int i(String tag, String msg) {
+        return 0;
+    }
+
+    public static int e(String tag, String msg) {
+        return 0;
+    }
+
+    public static int e(String tag, String msg, Throwable tr) {
+        return 0;
+    }
+}