wifi: ath12k: fix misspelling of "dma" in num_rxmda_per_pdev

The ath12k_hw_params member num_rxmda_per_pdev contains a misspelling
of "dma" so fix it.

No functional changes, compile tested only.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240504-ath12k_dp_rxdma_ring_sel_config_wcn7850-ret-v1-1-44d2843a2857@quicinc.com