qcacmn: Add WMI command to set Sub Channel Marking

Introduce a new wmi_send pdev param to enable/disable
"Subchannel Marking" in Firmware (only in  Full Offload)

Change-Id: I3cd4f4f13ebca72c4505b6195cc8dc4856d41671
CRs-Fixed: 2334258
5 files changed