Set apex_available property

The marked library(ies) were available to the adbd APEX 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.

Exempt-From-Owner-Approval: already +2'ed by the owner (enh)

Bug: 150999716
Bug: 151398197
Test: m
Merged-In: I8b572e3c4e76bd10c0443a6c08b72e9519243ab5
(cherry picked from commit d25bb60e056b2b68aaeead3025d8024eaf8e8b8d)
Change-Id: I8b572e3c4e76bd10c0443a6c08b72e9519243ab5
diff --git a/libasyncio/Android.bp b/libasyncio/Android.bp
index 4ab439d..44e7933 100644
--- a/libasyncio/Android.bp
+++ b/libasyncio/Android.bp
@@ -28,6 +28,10 @@
     defaults: ["libasyncio_defaults"],
     vendor_available: true,
     recovery_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.adbd",
+    ],
     host_supported: true,
     srcs: [
         "AsyncIO.cpp",