prov/efa: Adjust the logging for pke exhaustion

In efa_rdm_ep_post_handshake, the pke exhaustion shouldn't
be a warning as it is normal for a stressful receiver and
should be handled by EAGAIN / flow control

Signed-off-by: Shi Jin <sjina@amazon.com>

prov/efa/src/rdm/efa_rdm_ep_utils.c

@@ -607,7 +607,7 @@ ssize_t efa_rdm_ep_post_handshake(struct efa_rdm_ep *ep, struct efa_rdm_peer *pe
 
 	pkt_entry = efa_rdm_pke_alloc(ep, ep->efa_tx_pkt_pool, EFA_RDM_PKE_FROM_EFA_TX_POOL);
 	if (OFI_UNLIKELY(!pkt_entry)) {
-		EFA_WARN(FI_LOG_EP_CTRL, "PKE entries exhausted.\n");
+		EFA_DBG(FI_LOG_EP_CTRL, "PKE entries exhausted for posting handshake.\n");
 		efa_rdm_txe_release(txe);
 		return -FI_EAGAIN;
 	}