net: dsa: mv88e6xxx: fix internal PHYs for 6320 family

Fix internal PHYs definition for the 6320 family, which has only 2
internal PHYs (on ports 3 and 4).

Fixes: bc39315 ("net: dsa: mv88e6xxx: Add number of internal PHYs")
Signed-off-by: Marek Behún <kabel@kernel.org>
Cc: <stable@vger.kernel.org> # 6.6.x
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250317173250.28780-7-kabel@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: elkablo

drivers/net/dsa/mv88e6xxx/chip.c

@@ -6242,7 +6242,8 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.num_databases = 4096,
 		.num_macs = 8192,
 		.num_ports = 7,
-		.num_internal_phys = 5,
+		.num_internal_phys = 2,
+		.internal_phys_offset = 3,
 		.num_gpio = 15,
 		.max_vid = 4095,
 		.max_sid = 63,
@@ -6269,7 +6270,8 @@ static const struct mv88e6xxx_info mv88e6xxx_table[] = {
 		.num_databases = 4096,
 		.num_macs = 8192,
 		.num_ports = 7,
-		.num_internal_phys = 5,
+		.num_internal_phys = 2,
+		.internal_phys_offset = 3,
 		.num_gpio = 15,
 		.max_vid = 4095,
 		.max_sid = 63,