Revert "Remove libstlport from PRODUCT_PACKAGES."

The platform dependence on stlport is now far enough gone that a
regular build no longer builds stlport (woot!). Unfortunately, vendor
blobs don't claim their dependencies, so the build system has to keep
track of this for them.

Bug: 18777920
This reverts commit ef11722e9b778ac6a0edca2f51b9e510e79416f9.

Change-Id: I6a0dd26dfc6837c419eb5dd2ec5258dd323fd4bf
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index fb6ea42..aae7f95 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -50,6 +50,7 @@
     libpower \
     libsigchain \
     libstdc++ \
+    libstlport \
     libsurfaceflinger \
     libsurfaceflinger_ddmconnection \
     libsysutils \