Include runtime-module-sdk in the SDK build.

Test: build/soong/scripts/build-mainline-modules.sh
Bug: 152255951
Change-Id: I39f9024205a198ef8ce19e2c70e3b9dced54add1
diff --git a/scripts/build-mainline-modules.sh b/scripts/build-mainline-modules.sh
index 770adc9..f836ea9 100755
--- a/scripts/build-mainline-modules.sh
+++ b/scripts/build-mainline-modules.sh
@@ -19,6 +19,7 @@
   conscrypt-module-sdk
   conscrypt-module-test-exports
   conscrypt-module-host-exports
+  runtime-module-sdk
 )
 
 # We want to create apex modules for all supported architectures.