Crap, I knew I was going to forget something: add missing miibus method

description file which slipped through the cracks.

Pointed out by: Doug <Doug@gorean.org>

sys/dev/mii/miibus_if.m

@@ -0,0 +1,36 @@
+#	$Id$
+
+INTERFACE miibus;
+
+#
+# Read register from device on MII bus
+#
+METHOD int readreg {
+	device_t		dev;
+	int			phy;
+	int			reg;
+};
+
+#
+# Write register to device on MII bus
+#
+METHOD int writereg {
+	device_t		dev;
+	int			phy;
+	int			reg;
+	int			val;
+};
+
+#
+# Notify bus about PHY status change.
+#
+METHOD void statchg {
+	device_t		dev;
+};
+
+#
+# Notify bus that media has been set.
+#
+METHOD void mediainit {
+	device_t		dev;
+};