ARM: 8889/1: dt-bindings: document marvell,ecc-enable binding

Add documentation for the marvell,ecc-enable properties which can be
used to enable ECC on the Marvell aurora cache.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Documentation/devicetree/bindings/arm/l2c2x0.yaml

@@ -176,6 +176,10 @@ properties:
     description: disable parity checking on the L2 cache (L220 or PL310).
     type: boolean
 
+  marvell,ecc-enable:
+    description: enable ECC protection on the L2 cache
+    type: boolean
+
   arm,outer-sync-disable:
     description: disable the outer sync operation on the L2 cache.
       Some core tiles, especially ARM PB11MPCore have a faulty L220 cache that