net: dsa: mv88e6xxx: rename mv88e6xxx_vtu_stu_entry

The STU (if the switch has one) is abstracted and accessed through the
VTU operations and data registers.

Thus rename the mv88e6xxx_vtu_stu_entry struct to mv88e6xxx_vtu_entry.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index cf639ed..ee7873a 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -640,12 +640,9 @@
 	u8	mac[ETH_ALEN];
 };
 
-struct mv88e6xxx_vtu_stu_entry {
-	/* VTU only */
+struct mv88e6xxx_vtu_entry {
 	u16	vid;
 	u16	fid;
-
-	/* VTU and STU */
 	u8	sid;
 	bool	valid;
 	u8	data[DSA_MAX_PORTS];