Per i2c-imx-lpi2c.yaml, the imx8dxl lpi2c compatible should be:

compatible = "fsl,imx8dxl-lpi2c", "fsl,imx7ulp-lpi2c";

Change it accordingly to fix the following schema warning:

imx8dxl-evk.dtb: i2c@5a800000: compatible: 'oneOf' conditional failed, one must be fixed:
	['fsl,imx8dxl-lpi2c', 'fsl,imx8qxp-lpi2c', 'fsl,imx7ulp-lpi2c'] is too long
	'fsl,imx8dxl-lpi2c' is not one of ['fsl,imx7ulp-lpi2c']
	'fsl,imx7ulp-lpi2c' was expected
	from schema $id: http://devicetree.org/schemas/i2c/i2c-imx-lpi2c.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>