qcacld-3.0: Fix possible memory leak when set station key

If calling lim_send_set_sta_key_req with sendRsp==false, it didn't free
the tpSetStaKeyParams memory allocated in this function. This scenario
is possible hit when station key update during roaming before new bss
adding.

Change-Id: I29209576622bc2495a7ce3064e82efca2e70d19a
CRs-Fixed: 2452108