Include runtime-module-host-exports in the SDK build.

Test: build/soong/scripts/build-mainline-modules.sh
Bug: 152255951
Change-Id: I87a154a31409c83ccdd4637210f6163dfa2d7738
diff --git a/scripts/build-mainline-modules.sh b/scripts/build-mainline-modules.sh
index f836ea9..df763c8 100755
--- a/scripts/build-mainline-modules.sh
+++ b/scripts/build-mainline-modules.sh
@@ -20,6 +20,7 @@
   conscrypt-module-test-exports
   conscrypt-module-host-exports
   runtime-module-sdk
+  runtime-module-host-exports
 )
 
 # We want to create apex modules for all supported architectures.