Revert "dt-bindings: rcc: Add optional external ethernet RX clock properties"

This reverts commit 694ed992. The same
commit was also applied to stm32 tree.
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/clock/st,stm32mp1-rcc.yaml

@@ -59,14 +59,6 @@ properties:
           - st,stm32mp1-rcc
       - const: syscon
 
-  clocks:
-    description:
-      Specifies the external RX clock for ethernet MAC.
-    maxItems: 1
-
-  clock-names:
-    const: ETH_RX_CLK/ETH_REF_CLK
-
   reg:
     maxItems: 1