Update linkerconfig configuration format

Update linkerconfig configuration format as json.

Bug: 169634881
Test: cuttelfish boot succeeded
Change-Id: Ie95bc961e3b616acb33fc86025950d1c5ba7fd8b
diff --git a/apex/linker.config.json b/apex/linker.config.json
new file mode 100644
index 0000000..67c076e
--- /dev/null
+++ b/apex/linker.config.json
@@ -0,0 +1,3 @@
+{
+    "visible": true
+}