Note: Need to maintain same PDSCH and PUSCH TDA list lengths

If the PDSCH and PUSCH TDA lists have different lengths (before this
commit, PDSCH TDA list length was 2, for PUSCH 3), the OAI UE would get
confused: In the special case, the TDA in the DCI for UL was incorrectly
calculated, and a change of the PDSCH TDA list triggered UL never being
decoded correctly.