Add linkerconfig to Runtime APEX

Add linkerconfig to Runtime APEX module.

Bug: 165769179
Test: Cuttlefish boot succeeded
Change-Id: I31c4bfa2ce88b64d7100f227ec289416db253b13
diff --git a/linkerconfig/proto/Android.bp b/linkerconfig/proto/Android.bp
index c04887e..4d97128 100644
--- a/linkerconfig/proto/Android.bp
+++ b/linkerconfig/proto/Android.bp
@@ -7,6 +7,10 @@
         type: "lite",
     },
     srcs: ["linker_config.proto"],
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
 }
 
 python_library_host {