MAINTAINERS: Downgrade ocxl to Odd Fixes

There hasn't been any substantive work on the ocxl driver since 2020, and
all patches since then have been minor fixes or part of treewide or
arch-wide changes. Frederic and I are no longer spending much time on this
driver.

Downgrade the status of the ocxl driver to Odd Fixes, to reflect the
current reality.

Signed-off-by: Andrew Donnellan <[e-mail]>
Acked-by: Frederic Barrat <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

MAINTAINERS

···
 M:	Frederic Barrat <[e-mail]>
 M:	Andrew Donnellan <[e-mail]>
 L:	[e-mail]
-S:	Supported
+S:	Odd Fixes
 F:	Documentation/userspace-api/accelerators/ocxl.rst
 F:	arch/powerpc/include/asm/pnv-ocxl.h
 F:	arch/powerpc/platforms/powernv/ocxl.c