[D18] remove RTS/CTS property for uart4
The port uart4 does not have RTS and CTS available.
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mentioned in commit clea-os/layers/seco/meta-seco-imx@f406fbc0
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mentioned in merge request clea-os/layers/seco/meta-seco-imx!297
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mentioned in commit clea-os/seco-manifest@79dd556e
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mentioned in commit clea-os/layers/seco/meta-seco-imx@b5010791
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mentioned in commit clea-os/seco-manifest@a201c90f