wifi: ath12k: Remove obsolete struct wmi_peer_flags_map *peer_flags

wifi: ath12k: Remove obsolete struct wmi_peer_flags_map *peer_flags

Currently both struct ath12k_wmi_pdev and struct ath12k_wmi_base
define:
        const struct wmi_peer_flags_map *peer_flags;

But that member is not used, and in fact, struct wmi_peer_flags_map
is not defined within ath12k; these are obsolete remnants inherited
from ath11k. So remove them.

Compile tested only.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20231106-ath-peer-flags-v1-2-781e83b7e8e8@quicinc.com