wifi: ath12k: change WLAN_SCAN_PARAMS_MAX_IE_LEN from 256 to 512

Mac80211 needs more space for P2P scan ie in P2P mode, 256 is not
enough, resize it to 512.

Also delete the duplicate macro definitions in wmi.h.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Signed-off-by: Kang Yang <quic_kangyang@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240130040303.370590-8-quic_kangyang@quicinc.com