generic: 5.15: backport support for Marvell 88E6361 switch

New revision of Methode eDPU boards uses Marvell 88E6361 switch, so lets
backport it from kernel 6.5.

Since 5.15 doesnt have phylink_get_caps I had to modify the backport to
use the old mv88e6393x_phylink_validate instead.
I had to fixup one more instance of port_max_speed_mode as well that is not
present in 6.5.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>

target/linux/generic/hack-5.15/711-net-dsa-mv88e6xxx-disable-ATU-violation.patch

@@ -9,7 +9,7 @@ Subject: [PATCH] net/dsa/mv88e6xxx: disable ATU violation
 
 --- a/drivers/net/dsa/mv88e6xxx/chip.c
 +++ b/drivers/net/dsa/mv88e6xxx/chip.c
-@@ -2993,6 +2993,9 @@ static int mv88e6xxx_setup_port(struct m
+@@ -3015,6 +3015,9 @@ static int mv88e6xxx_setup_port(struct m
  	else
  		reg = 1 << port;