dt-bindings: arm: fsl: Fix bindings for LS1012A and LS1021A based boards

Fix devicetree bindings for Freescale LS1012A and LS1021A SoC based boards.

Fixes: a1a38e1f ("dt-bindings: arm: Convert FSL board/soc bindings to json-schema")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>