Fix build: Revert "Switching to the final PDF rendering library"

This reverts commit 7a32ace471423666c9366f9beeefec9b9c5251eb.

Change-Id: Icf5b4e16e12a0ca6f7fb662472801f90840a743f
diff --git a/target/product/base.mk b/target/product/base.mk
index c7a7141..548fb31 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -61,7 +61,7 @@
     libnetd_client \
     libnetlink \
     libnetutils \
-    libpdfium \
+    libpdfrenderer \
     libreference-ril \
     libreverbwrapper \
     libril \