Add dependency on libdl_android

platform private symbols have been moved to libdl_android.so
since they are not intended to be accessible from apps.

Test: make
Bug: http://b/129387775
Change-Id: I2ad02e0a6cdbf5b9aba323523dd56a2c378e72f0
(cherry picked from commit 128a767f20f6c44128c3f2283d5026202fa4707d)
diff --git a/media/libstagefright/Android.bp b/media/libstagefright/Android.bp
index bc7569f..89e7c54 100644
--- a/media/libstagefright/Android.bp
+++ b/media/libstagefright/Android.bp
@@ -137,6 +137,7 @@
         "libcamera_client",
         "libcutils",
         "libdl",
+        "libdl_android",
         "libdrmframework",
         "libgui",
         "libion",