Add iw as a previously debug tagged module

From external/iw

Test: check installed files on debug builds
Change-Id: Ie1282e88dfee47f958e13fd7ec17163f1178cb22
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 08f70a3..408e602 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -314,6 +314,7 @@
     apex.test.key \
     arping \
     iotop \
+    iw \
     logpersist.start \
     perfprofd \
     procrank \