wifi: ath11k: fix misspelling of "dma" in num_rxmda_per_pdev

The ath11k_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-ath11k-num_rxmda_per_pdev-v1-1-7f97bced8495@quicinc.com