qcacld-3.0: Remove struct sme_session_params

The usage of struct sme_session_params was removed by:
  qcacld-3.0: Send vdev create to fw from object create notification
  Change-Id Ibba02f6b5885d7b3a62529ef51768f520395513e

But the struct itself wasn't removed, so remove it now.

Change-Id: I86b23fe60186fe43b6c07ade034fd98598da3127
CRs-Fixed: 3429715

core/sme/inc/sme_api.h

@@ -208,14 +208,6 @@ struct sme_5g_band_pref_params {
 	uint8_t     max_rssi_penalize_5g;
 };
 
-/**
- * struct sme_session_params: Session creation params passed by HDD layer
- * @vdev: pointer to vdev object
- */
-struct sme_session_params {
-	struct wlan_objmgr_vdev *vdev;
-};
-
 #define MAX_CANDIDATE_INFO 10
 
 /**