scsi: MAINTAINERS: Make cxlflash obsolete

The cxlflash driver is no longer actively maintained and we intend to
remove it in a future kernel release. Change its status to obsolete.

While we're here, Matthew Ochs no longer works at IBM and is no longer in a
position to access cxlflash hardware, so remove him from the maintainers
list.

Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Link: https://lore.kernel.org/r/20240409031027.41587-1-ajd@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: ajdlinux

MAINTAINERS

@@ -5781,10 +5781,9 @@ F:	include/uapi/misc/cxl.h
 
 CXLFLASH (IBM Coherent Accelerator Processor Interface CAPI Flash) SCSI DRIVER
 M:	Manoj N. Kumar <manoj@linux.ibm.com>
-M:	Matthew R. Ochs <mrochs@linux.ibm.com>
 M:	Uma Krishnan <ukrishn@linux.ibm.com>
 L:	linux-scsi@vger.kernel.org
-S:	Supported
+S:	Obsolete
 F:	Documentation/arch/powerpc/cxlflash.rst
 F:	drivers/scsi/cxlflash/
 F:	include/uapi/scsi/cxlflash_ioctl.h