Add apex to libloading rust crate

... for eventually including in crosvm build for Cuttlefish.

Bug: 189133053
Test: `m` with vulkano gralloc enabled in crosvm
Change-Id: Ife9004eadb69bd440415f187773ac90cb013ea58
diff --git a/Android.bp b/Android.bp
index 63cb45b..ffc103e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -29,4 +29,8 @@
     rustlibs: [
         "libcfg_if",
     ],
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.virt",
+    ],
 }
diff --git a/cargo2android.json b/cargo2android.json
index 1b6cca2..42b7833 100644
--- a/cargo2android.json
+++ b/cargo2android.json
@@ -1,4 +1,8 @@
 {
+  "apex-available": [
+    "//apex_available:platform",
+    "com.android.virt"
+  ],
   "dependencies": true,
   "device": true,
   "run": true