Revert "libmdnssd is only used by adbd."

This reverts commit 1ecbeae2ddecb331e9067c409c4def26e6982ac8.

Reason for revert: Prime candidate as culprit for build breakage
build_id/11678886
 
Bug: 333111739

Change-Id: I24ee63b7cfe738e505e691b2d111c4a816513657
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 8dc680b..884af4f 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -172,6 +172,7 @@
     libjpeg \
     liblog \
     libm.bootstrap \
+    libmdnssd \
     libmedia \
     libmedia_jni \
     libmediandk \