Add additional options to EFI build

ipxe/local/general.h.efi

@@ -2,5 +2,7 @@
 #define DOWNLOAD_PROTO_HTTPS  /* Secure Hypertext Transfer Protocol */      
 #define IMAGE_TRUST_CMD	      /* Image trust management commands */
 #define NET_PROTO_IPV6        /* IPv6 protocol */
+#define NSLOOKUP_CMD          /* DNS resolving command */
+#define NTP_CMD               /* NTP commands */
 #define REBOOT_CMD            /* Reboot command */
 #define VLAN_CMD              /* VLAN commands */