qcacld-3.0: Remove struct tag_scanreq_param
Change Ibea328196a9453ebaae887aa4068e78c47296762 ("qcacld-3.0:
Scan cleanup in lim and csr") removed the last references to
struct tag_scanreq_param. Since it is now obsolete, remove it.
Change-Id: I3c4d929696a8e70b14c3a0a7f706b5665a90532e
CRs-Fixed: 2375435