net: dsa: mv88e6xxx: fix 88E6393X family internal phys layout

88E6393X/88E6193X/88E6191X switches have in fact 8 internal PHYs, but those
are not present starting at port 0: supported ports go from 1 to 8
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -6047,7 +6047,8 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.name = "Marvell 88E6191X",
 		.num_databases = 4096,
 		.num_ports = 11,	/* 10 + Z80 */
-		.num_internal_phys = 9,
+		.num_internal_phys = 8,
+		.internal_phys_offset = 1,
 		.max_vid = 8191,
 		.max_sid = 63,
 		.port_base_addr = 0x0,
@@ -6070,7 +6071,8 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.name = "Marvell 88E6193X",
 		.num_databases = 4096,
 		.num_ports = 11,	/* 10 + Z80 */
-		.num_internal_phys = 9,
+		.num_internal_phys = 8,
+		.internal_phys_offset = 1,
 		.max_vid = 8191,
 		.max_sid = 63,
 		.port_base_addr = 0x0,
@@ -6389,7 +6391,8 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.name = "Marvell 88E6393X",
 		.num_databases = 4096,
 		.num_ports = 11,	/* 10 + Z80 */
-		.num_internal_phys = 9,
+		.num_internal_phys = 8,
+		.internal_phys_offset = 1,
 		.max_vid = 8191,
 		.max_sid = 63,
 		.port_base_addr = 0x0,