Add iperf3 to debug packages

Bug: 123261826
Test: manual build
Change-Id: Ia7639daccd8ec9e48dbc1e900669c821f73a8be7
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 60646c3..cd98a48 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -359,6 +359,7 @@
     gdbserver \
     init-debug.rc \
     iotop \
+    iperf3 \
     iw \
     logpersist.start \
     logtagd.rc \