wifi: ath12k: avoid bit operation on key flags

wifi: ath12k: avoid bit operation on key flags

WMI_KEY_PAIRWISE and WMI_KEY_GROUP are not bit fields, change
bit operation to direct assignment to avoid confusion.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00217-QCAHKSWPL_SILICONZ-1

Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250523-ath12k-unicast-key-first-v1-1-f53c3880e6d8@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>