Fix SsDomainController to support terminal-based CLIR with vendor IMS

If vendor Ims service handles the terminal based call waiting service
by itself, we should forward the request to Ims service as legacy
implementation when Ut is available.

Bug: 237030511
Test: atest
Change-Id: I701cf010da26a7fd4b93e06e99f9dcdcaf0d0e81