sfxge(4): add Medford2 support to MON module

Submitted by:   Andy Moreton <amoreton at solarflare.com>
Sponsored by:   Solarflare Communications, Inc.
Differential Revision:  https://reviews.freebsd.org/D18157

sys/dev/sfxge/common/mcdi_mon.c

@@ -503,6 +503,11 @@ mcdi_mon_cfg_build(
 	case EFX_FAMILY_MEDFORD:
 		encp->enc_mon_type = EFX_MON_SFC92X0;
 		break;
+#endif
+#if EFSYS_OPT_MEDFORD2
+	case EFX_FAMILY_MEDFORD2:
+		encp->enc_mon_type = EFX_MON_SFC92X0;
+		break;
 #endif
 	default:
 		rc = EINVAL;