Set apex_available property

The marked library(ies) were available to the APEXes via the
hand-written whitelist in build/soong/apex/apex.go. Trying to remove the
whitelist by adding apex_available property to the Android.bp of the
libraries.

Bug: 150999716
Test: m
Merged-In: Ie9a693be10c6c6571c8aa5357500f5d931400593
(cherry picked from commit 0f152391c0458d3d1cce04a11bc92e7234955d6f)
Change-Id: Ie9a693be10c6c6571c8aa5357500f5d931400593
diff --git a/runtime/Android.bp b/runtime/Android.bp
index db2579b..318f930 100644
--- a/runtime/Android.bp
+++ b/runtime/Android.bp
@@ -702,6 +702,11 @@
     host_supported: true,
     export_include_dirs: ["."],
     sdk_version: "current",
+
+    apex_available: [
+        "com.android.art.debug",
+        "com.android.art.release",
+    ],
 }
 
 genrule {