Prevent building T+ sources on sc-mainline-prod

Points service-connectivity-tiramisu-sources to empty stubs instead.

Test: TH
Merged-In: I06e2568e5e01d855783383552d1b0d7732cefbe0
Change-Id: I6a9ce3d6f6f430576c54fa1171b43d2dff18e6e0
1 file changed