Do not build stats-log-api-gen-exports in mainline builds

This no longer needs to be a prebuilt since stats-log-api-gen can be
built from proto_logging without extra dependencies.

Test: Treehugger
Bug: 170149255
Change-Id: I6925c2526cee1cbff3ba78bedd7f6c2f58dfff0f
diff --git a/scripts/build-mainline-modules.sh b/scripts/build-mainline-modules.sh
index 18174a4..30cb937 100755
--- a/scripts/build-mainline-modules.sh
+++ b/scripts/build-mainline-modules.sh
@@ -27,7 +27,6 @@
   platform-mainline-test-exports
   runtime-module-host-exports
   runtime-module-sdk
-  stats-log-api-gen-exports
   statsd-module-sdk
   statsd-module-sdk-for-art
   tzdata-module-test-exports