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Fix DMRS for PUCCH format 2

Roberto Louro Maguetarequested to merge
fix-DMRS-PUCCH2 into develop

This MR fixes the DMRS for PUCCH format 2.

While at the OAI-UE we have:

uint16_t startingPRB = pucch_pdu->prb_start + pucch_pdu->bwp_start;
uint idxGold = startingPRB >> 2;
uint32_t *seq = gold_cache(temp_x2, idxGold + pucch_pdu->prb_size);

At gNB side, it was missing pucch_pdu->bwp_start, i.e., it was:

uint32_t *sGold = gold_cache(x2, pucch_pdu->prb_start / 4 + ngroup / 2);
uint8_t *sGold8 = (uint8_t *)(sGold + pucch_pdu->prb_start / 4);

This MR was tested with COTS UE with a bwp_start other than 0, and now PUCCH format 2 is being decoded correctly.

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