qsap: Support to configured Vendor IE elements in hostapd.conf.

With this commit, able to configured vendor_elements and
assocresp_elements in hostapd.conf file.
i.e
  qdc softap qccmd set vendor_elements=<Values>
  qdc softap qccmd set assocresp_elements=<Values>

Change-Id: Ib67413779a347c6567ab093bf84f87b1b63cc7db
CRs-Fixed: 2197458

softap/sdk/qsap_api.c

@@ -180,6 +180,8 @@ static struct Command cmd_list[eCMD_LAST] = {
     { "ssid2",                 NULL             },
     { "bridge",                NULL             },
     { "ctrl_interface",        NULL             },
+    { "vendor_elements",       NULL             },
+    { "assocresp_elements",    NULL             },
 };
 
 struct Command qsap_str[eSTR_LAST] = {