dt-bindings: net: snps, dwmac: remove tx-sched-sp property

Strict priority for the tx scheduler is by default in Linux driver, so the
tx-sched-sp property was removed in commit aed68640 ("net: stmmac:
platform: Delete a redundant condition branch").

This property is still in use in the following DT (and it will be removed
in a separate patch series):

- arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi
- arch/arm64/boot/dts/freescale/imx8mp-evk.dts
- arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
- arch/arm64/boot/dts/qcom/sa8540p-ride.dts
- arch/arm64/boot/dts/qcom/sa8775p-ride.dts

There is no problem if that property is still used in the DTs above,
since, as seen above, it is a default property of the driver.
Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Adam Ford <aford173@gmail.com>
Link: https://lore.kernel.org/r/20240429092654.31390-2-f.suligoi@asem.itSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/snps,dwmac.yaml

@@ -328,9 +328,6 @@ properties:
       snps,tx-sched-dwrr:
         type: boolean
         description: Deficit Weighted Round Robin
-      snps,tx-sched-sp:
-        type: boolean
-        description: Strict priority
     allOf:
       - if:
           required:
@@ -339,7 +336,6 @@ properties:
           properties:
             snps,tx-sched-wfq: false
             snps,tx-sched-dwrr: false
-            snps,tx-sched-sp: false
       - if:
           required:
             - snps,tx-sched-wfq
@@ -347,7 +343,6 @@ properties:
           properties:
             snps,tx-sched-wrr: false
             snps,tx-sched-dwrr: false
-            snps,tx-sched-sp: false
       - if:
           required:
             - snps,tx-sched-dwrr
@@ -355,15 +350,6 @@ properties:
           properties:
             snps,tx-sched-wrr: false
             snps,tx-sched-wfq: false
-            snps,tx-sched-sp: false
-      - if:
-          required:
-            - snps,tx-sched-sp
-        then:
-          properties:
-            snps,tx-sched-wrr: false
-            snps,tx-sched-wfq: false
-            snps,tx-sched-dwrr: false
     patternProperties:
       "^queue[0-9]$":
         description: Each subnode represents a queue.