dt-bindings: net: phy: mscc: vsc8531: factorize vsc8531, led-N-mode

VSC8584 supports 4 LEDs while VSC8531 only supports 2. Let's factorize
the documentation for LED mode properties and give the 4 default values
(the first two being shared between VSC8531 and VSC8584).
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt

@@ -22,14 +22,16 @@ Optional properties:
 			  'vddmac'.
 			  Default value is 0%.
 			  Ref: Table:1 - Edge rate change (below).
-- vsc8531,led-0-mode	: LED mode. Specify how the LED[0] should behave.
-			  Allowed values are define in
+- vsc8531,led-[N]-mode	: LED mode. Specify how the LED[N] should behave.
+			  N depends on the number of LEDs supported by a
+			  PHY.
+			  Allowed values are defined in
 			  "include/dt-bindings/net/mscc-phy-vsc8531.h".
-			  Default value is VSC8531_LINK_1000_ACTIVITY (1).
-- vsc8531,led-1-mode	: LED mode. Specify how the LED[1] should behave.
-			  Allowed values are define in
-			  "include/dt-bindings/net/mscc-phy-vsc8531.h".
-			  Default value is VSC8531_LINK_100_ACTIVITY (2).
+			  Default values are VSC8531_LINK_1000_ACTIVITY (1),
+			  VSC8531_LINK_100_ACTIVITY (2),
+			  VSC8531_LINK_ACTIVITY (0) and
+			  VSC8531_DUPLEX_COLLISION (8).
+
 
 Table: 1 - Edge rate change
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