Add requestsync package

Change-Id: I0429a7cb238b124d3e42927b9dc806bbd5af0622
diff --git a/target/product/core.mk b/target/product/core.mk
index 5791048..9583753 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -98,6 +98,7 @@
     libwebrtc_audio_preprocessing \
     libwilhelm \
     libz \
+    requestsync \
     screencap \
     sensorservice