dt-bindings: arm/calxeda: drop unneeded quotes

Drop unneeded quotes over simple string values to fix a soon to be
enabled yamllint warning:

[error] string value is redundantly quoted with any quotes (quoted-strings)

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/arm/calxeda/l2ecc.yaml

···
 
 properties:
   compatible:
-    const: "calxeda,hb-sregs-l2-ecc"
+    const: calxeda,hb-sregs-l2-ecc
 
   reg:
     maxItems: 1