ath11k: Implement remain-on-channel support

Add remain on channel support, it is needed in several
scenarios such as Passpoint etc.

Currently this is supported by QCA6390, WCN6855, IPQ8074,
IPQ6018 and QCN9074.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1

Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220506013614.1580274-2-quic_bqiang@quicinc.com