qcacld-3.0: Use pre_auth_channel_freq to replace preAuthchannelNum

Add pre_auth_channel_freq into struct sSirFTPreAuthReq and replace
preAuthchannelNum.

Change-Id: I47f8a1e4057b4efd2a307b26c066a695e5338aa2
CRs-Fixed: 2568598
5 files changed