dt-bindings: net: lantiq-xrx200-net: Remove the burst length properties

All SoCs with this IP core support 8 burst length. Hauke
suggested to hardcode this value and simplify the driver.

Link: https://lkml.org/lkml/2021/9/14/1533
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/lantiq,xrx200-net.yaml

@@ -29,18 +29,6 @@ properties:
       - const: tx
       - const: rx
 
-  lantiq,tx-burst-length:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      TX programmable burst length.
-    enum: [2, 4, 8]
-
-  lantiq,rx-burst-length:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      RX programmable burst length.
-    enum: [2, 4, 8]
-
   '#address-cells':
     const: 1
 
@@ -53,8 +41,6 @@ required:
   - interrupt-parent
   - interrupts
   - interrupt-names
-  - lantiq,tx-burst-length
-  - lantiq,rx-burst-length
   - "#address-cells"
   - "#size-cells"
 
@@ -70,6 +56,4 @@ examples:
         interrupt-parent = <&icu0>;
         interrupts = <73>, <72>;
         interrupt-names = "tx", "rx";
-        lantiq,tx-burst-length = <8>;
-        lantiq,rx-burst-length = <8>;
     };