net: dsa: mv88e6xxx: add POT flag to 88E6390

The 88E6390 family clear the Priority Override Table the same way as
88E6352, thus add MV88E6XXX_FLAG_G2_POT to MV88E6XXX_FLAGS_FAMILY_6390.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.h

@@ -174,6 +174,7 @@ enum mv88e6xxx_cap {
 #define MV88E6XXX_FLAGS_FAMILY_6390	\
 	(MV88E6XXX_FLAG_EEE |		\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
+	 MV88E6XXX_FLAG_G2_POT |	\
 	 MV88E6XXX_FLAGS_MULTI_CHIP)
 
 struct mv88e6xxx_ops;