rm only_update_telephony_on_valid_sub_ids flag from CTS

Removing all references to only_update_telephony_on_valid_sub_ids as
a part of a cleanup effort.  Falgged changes can be found in
ag/24719546 and ag/24722567

Flag: EXEMPT flag cleanup
Fixes: 409611934
Test: atest CtsTelecomTestCases
Change-Id: I66ef117f55f26662a38371e3e8093372b0af9a13
3 files changed