MAINTAINERS: add myself as maintainer for the fsl-mc bus

Both Laurentiu and Stuart left the company and are no longer involved
with the fsl-mc bus. Remove them and add myself as maintainer.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20250320120319.3520315-2-ioana.ciornei@nxp.com
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

Author: IoanaCiornei

MAINTAINERS

@@ -19294,8 +19294,7 @@ F:	fs/qnx6/
 F:	include/linux/qnx6_fs.h
 
 QORIQ DPAA2 FSL-MC BUS DRIVER
-M:	Stuart Yoder <stuyoder@gmail.com>
-M:	Laurentiu Tudor <laurentiu.tudor@nxp.com>
+M:	Ioana Ciornei <ioana.ciornei@nxp.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	Documentation/ABI/stable/sysfs-bus-fsl-mc