MAINTAINERS: change the NXP FSPI driver maintainer.

Haibo Chen and me will take over the NXP FSPI driver maintainer role.

Signed-off-by: Han Xu <han.xu@nxp.com>
Link: https://lore.kernel.org/r/20220711160802.4938-1-han.xu@nxp.com


Signed-off-by: Mark Brown <broonie@kernel.org>