wifi: ath12k: remove redundant declaration of ath12k_dp_rx_h_find_peer()

wifi: ath12k: remove redundant declaration of ath12k_dp_rx_h_find_peer()

The current code in dp_rx.h declares the ath12k_dp_rx_h_find_peer() twice.
Fix this by removing one of the redundant declarations of
ath12k_dp_rx_h_find_peer() to ensure that the function is declared only
once.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: P Praneesh <praneesh.p@oss.qualcomm.com>
Link: https://patch.msgid.link/20250219053640.223734-1-praneesh.p@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>