arm64: dts: layerscape: remove unused num-viewport

arm64: dts: layerscape: remove unused num-viewport

Remove unused property num-viewport to fix dtbs warnings.

arch/arm64/boot/dts/freescale/fsl-ls1012a-frwy.dtb: pcie@3400000: Unevaluated properties are not allowed ('num-viewport' was unexpected)
    from schema $id: http://devicetree.org/schemas/pci/fsl,layerscape-pcie.yaml#
arch/arm64/boot/dts/freescale/fsl-ls1012a-oxalis.dtb: pcie@3400000: Unevaluated properties are not allowed ('num-viewport' was unexpected)
    from schema $id: http://devicetree.org/schemas/pci/fsl,layerscape-pcie.yaml#

Cc: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>