Make statsd apex available as a prebuilt

Bug: 178236337
Test: build-mainline-modules.sh
Change-Id: I807eca7c5296227f4b593fc9f52d29bd20e78645
diff --git a/scripts/build-mainline-modules.sh b/scripts/build-mainline-modules.sh
index ac67438..b93c883 100755
--- a/scripts/build-mainline-modules.sh
+++ b/scripts/build-mainline-modules.sh
@@ -8,6 +8,7 @@
   com.android.art.testing
   com.android.conscrypt
   com.android.i18n
+  com.android.os.statsd
   com.android.runtime
   com.android.tzdata
 )