qcacmn: Add documentation for mlme api

Adds documentation for callback api
mlme_cm_roam_get_scan_ie_cb.

Change-Id: Ibc0e3ad80bff24afa8e6f31090a30753f9228ef5
CRs-Fixed: 3390453

umac/mlme/include/wlan_mlme_cmn.h

@@ -74,6 +74,11 @@
  * @mlme_cm_roam_cmpl_cb: Roam sync complete cb
  * @vdev: vdev pointer
  *
+ * @mlme_cm_roam_get_scan_ie_cb: Get scan ie cb
+ * @vdev: vdev pointer
+ * @scan_ie: scan ie element pointer
+ * @dot11mode_filter: dot11mode filter enumn pointer
+ *
  * @mlme_cm_ft_preauth_cmpl_cb: Roam ft preauth complete cb
  * @vdev: vdev pointer
  * @rsp: preauth response pointer