dt-bindings: mmc: fsl-imx-esdhc: update i.MX8DXL compatible

i.MX8DXL is compatible with i.MX8QXP, so update binding doc.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221010101138.295332-1-peng.fan@oss.nxp.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>