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
Merged-In: I34935206e078a064841fe00b293f24df358e50ad
Change-Id: I34935206e078a064841fe00b293f24df358e50ad
(cherry picked from commit 6d235293)