qcacld-3.0: Remove csr_store_joinreq_param()

Change I92f79f595e881fccb6eb5e87fcfa29e8f26fa1a5 ("qcacld-3.0:
Remove sme_store_joinreq_param()") removed the last client of
csr_store_joinreq_param(). Since this function is now unused,
remove it.

Change-Id: Ie3f7a8a581a505a29ddb96825eafe265c6d01479
CRs-Fixed: 2371142
2 files changed