OWE: Use PMKSA caching if available with driver AP MLME

If a matching PMKSA cache entry is present for an OWE client, use it and
do not go through DH while processing Association Rquest frame.
Association Response frame will identify the PMKID in such a case and DH
parameters won't be present.

Signed-off-by: Ashok Ponnaiah <aponnaia@codeaurora.org>

src/ap/drv_callbacks.c

@@ -530,7 +530,8 @@ skip_wpa_check:
 
 		npos = owe_auth_req_process(hapd, sta,
 					    elems.owe_dh, elems.owe_dh_len,
-					    p, &reason);
+					    p, sizeof(buf) - (p - buf),
+					    &reason);
 		if (npos)
 			p = npos;
 		if (!npos &&