Mark Media APEX as visible

Linkerconfig is going to remove all hard-coded dependencies from APEX
modules and let APEX modules specify its own requirements. As part of
it, this change adds a new configuration file for linkerconfig and let
it aware that media APEX should be visible from all sections.

Bug: 167946001
Test: atest passed
Change-Id: Id1ef65a0b804756a27440c4c1a4c38fd775fccd9
diff --git a/apex/Android.bp b/apex/Android.bp
index c5dd420..86b2171 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -56,6 +56,16 @@
     name: "com.android.media",
     manifest: "manifest.json",
     defaults: ["com.android.media-defaults"],
+    prebuilts: [
+        "media-linker-config",
+    ],
+}
+
+prebuilt_etc {
+    name: "media-linker-config",
+    src: "linker.config.txt",
+    filename: "linker.config.txt",
+    installable: false,
 }
 
 filegroup {
diff --git a/apex/linker.config.txt b/apex/linker.config.txt
new file mode 100644
index 0000000..d1c815b
--- /dev/null
+++ b/apex/linker.config.txt
@@ -0,0 +1,7 @@
+# Extra linker configurations for media APEX
+# See https://android.googlesource.com/platform/system/linkerconfig/+/master/README.md#apex_etc_linker_config_txt
+
+[properties]
+
+# Set media APEX as force visible so media APEX namespace is accessible via android_get_exported_namespace
+visible = true