wifi: ath12k: pass BSSID index as input for EMA

wifi: ath12k: pass BSSID index as input for EMA

Function ath12k_mac_setup_bcn_tmpl_ema() retrieves 'bss_conf'
only to get BSSID index which is an overhead because the
caller ath12k_mac_setup_bcn_tmpl() has already stored this
locally. Pass the index as an input instead.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aloka Dixit <aloka.dixit@oss.qualcomm.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250210182718.408891-6-aloka.dixit@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>