dt-bindings: memory-controllers: fsl,imx8m-ddrc: drop Leonard Crestez

Emails to Leonard Crestez bounce ("550 5.4.1 Recipient address rejected:
Access denied:), so change maintainer to Peng Fan from NXP.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20220817065946.24303-2-krzysztof.kozlowski@linaro.org
Link: https://lore.kernel.org/r/20220909153037.824092-1-krzysztof.kozlowski@linaro.org

'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>