bsc: add TC_imm_ass_pre_ts_ack_dyn_ts

Test the experimental 'immediate-assignment pre-ts-ack' implemented in
I19e6a3d614aa5ae24d64eed96caf53e6f0e8bb74

Related: SYS#5559
Change-Id: I2ae28cd92910d4bc341a88571599347a64a18fe5
1 file changed