dhcp/dhcpserver Fix max station limit check in dhcp server

Currently when MAX_STATION limit in DHCP config is set to N, dhcp server
issues only N-1 IP addresses. This is problematic from customer
perspective if both SoftAP MAX_STATION and DHCP MAX_STATION limit is set
to same value. With this change DHCP server can issue N addresses that
is inline with the set limit.

Closes TW<20556>

components/lwip/apps/dhcpserver.c

@@ -1247,7 +1247,7 @@ void dhcps_coarse_tmr(void)
         }
     }
 
-    if (num_dhcps_pool >= MAX_STATION_NUM) {
+    if (num_dhcps_pool > MAX_STATION_NUM) {
         kill_oldest_dhcps_pool();
     }
 }