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

MAINTAINERS

@@ -14234,7 +14234,8 @@ S:	Maintained
 F:	drivers/net/phy/nxp-c45-tja11xx.c
 
 NXP FSPI DRIVER
-M:	Ashish Kumar <ashish.kumar@nxp.com>
+M:	Han Xu <han.xu@nxp.com>
+M:	Haibo Chen <haibo.chen@nxp.com>
 R:	Yogesh Gaur <yogeshgaur.83@gmail.com>
 L:	linux-spi@vger.kernel.org
 S:	Maintained