Migrate libEGL to ndk_library.

Test: make checkbuild
Bug: http://b/30465923
Change-Id: I154a95c6fde9c34d770b6fe65bfd71ac51e05574
diff --git a/opengl/libs/Android.bp b/opengl/libs/Android.bp
index f28d4ff..8e90acf 100644
--- a/opengl/libs/Android.bp
+++ b/opengl/libs/Android.bp
@@ -20,3 +20,10 @@
         },
     },
 }
+
+// The headers module is in frameworks/native/opengl/Android.bp.
+ndk_library {
+    name: "libEGL.ndk",
+    symbol_file: "libEGL.map.txt",
+    first_version: "9",
+}