wifi: ath12k: propagate EHT capabilities to userspace

Propagate EHT capabilities to the userspace using a new member
'eht_cap' in structure ieee80211_sband_iftype_data.

MCS-NSS capabilities are copied depending on the supported bandwidths
for the given band.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Signed-off-by: Aloka Dixit <quic_alokad@quicinc.com>
Signed-off-by: Pradeep Kumar <Chitrapu&lt;quic_pradeepc@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230725224034.14045-5-quic_alokad@quicinc.com