qcacmn: Send the supported channel list length correctly to FW

Currently, peer supported channel list length is updated first,
and then channel list updated by removing the DFS and invalid
channels. So, Wrong channel list length is sent to FW.

Change-Id: I1e71bdeae3d5368fbea85ae5e47e13c326e36375
CRs-Fixed: 2344729
1 file changed