These are needed for CPU ethernet links for switches.

Fixes dtbs_check warnings:

switch@1e (brcm,bcm53125): ports:port@5: 'phy-mode' is a required property
switch@1e (brcm,bcm53125): ports:port@8: 'phy-mode' is a required property
switch@1e (brcm,bcm53125): ports:port@8: 'oneOf' conditional failed, one must be fixed:

'fixed-link' is a required property
'phy-handle' is a required property
'managed' is a required property
from schema $id: http://devicetree.org/schemas/net/dsa/brcm,b53.yaml

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 arch/arm/boot/dts/broadcom/bcm53573.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/broadcom/bcm53573.dtsi b/arch/arm/boot/dts/broadcom/bcm53573.dtsi
index 2c43be98090b..1dd2e984b1e9 100644
--- a/arch/arm/boot/dts/broadcom/bcm53573.dtsi
+++ b/arch/arm/boot/dts/broadcom/bcm53573.dtsi
@@ -226,6 +226,7 @@ port@4 {
 
 						port@5 {
 							reg = <5>;
+							phy-mode = "internal";
 							ethernet = <&gmac1>;
 
 							fixed-link {
@@ -236,7 +237,13 @@ fixed-link {
 
 						port@8 {
 							reg = <8>;
+							phy-mode = "internal";
 							ethernet = <&gmac0>;
+
+							fixed-link {
+								speed = <1000>;
+								full-duplex;
+							};
 						};
 					};
 				};
-- 
2.55.0