MAINTAINERS: repair file entry in COMPUTE EXPRESS LINK

Commit 12fb28ea ("EINJ: Add CXL error type support") adds the header
file include/linux/einj-cxl.h, but then adds a file entry with cxl-einj.h
(note the swapping of words) to the COMPUTE EXPRESS LINK (CXL) section.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

get_maintainer.pl can only return commit_signer history for file
include/linux/einj-cxl.h because the entry in MAINTAINERS is wrong.
Correct the entry so that the full MAINTAINER list is returned.

Repair the file entry in COMPUTE EXPRESS LINK (CXL).
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/20240411062443.47372-1-lukas.bulwahn@redhat.comSigned-off-by: Dave Jiang <dave.jiang@intel.com>

MAINTAINERS

@@ -5332,7 +5332,7 @@ M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-cxl@vger.kernel.org
 S:	Maintained
 F:	drivers/cxl/
-F:	include/linux/cxl-einj.h
+F:	include/linux/einj-cxl.h
 F:	include/linux/cxl-event.h
 F:	include/uapi/linux/cxl_mem.h
 F:	tools/testing/cxl/