mm: update MAINTAINERS entry for HMM

Jérôme has moved on from RH and has not been looking at HMM patches for
some time. I've made the most changes to the core code in the recent
period and Leon is now working on the HMM side from the RDMA ODP.

Link: https://lkml.kernel.org/r/[email protected]
Closes: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Jason Gunthorpe <[email protected]>
Reported-by: Marek Szyprowski <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Leon Romanovsky <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: jgunthorpe

CREDITS

@@ -1397,6 +1397,10 @@ N: Thomas Gleixner
 E: [email protected]
 D: NAND flash hardware support, JFFS2 on NAND flash
 
+N: Jérôme Glisse
+E: [email protected]
+D: HMM - Heterogeneous Memory Management
+
 N: Richard E. Gooch
 E: [email protected]
 D: parent process death signal to children

MAINTAINERS

@@ -11006,7 +11006,8 @@ F:	Documentation/ABI/testing/debugfs-hisi-zip
 F:	drivers/crypto/hisilicon/zip/
 
 HMM - Heterogeneous Memory Management
-M:	Jérôme Glisse <[email protected]>
+M:	Jason Gunthorpe <[email protected]>
+M:	Leon Romanovsky <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	Documentation/mm/hmm.rst