mailmap: add entry for John Garry

get_maintainers.pl sometimes suggests my name and old e-mail address, so
update .mailmap to point to my current e-mail address.

Link: https://lkml.kernel.org/r/20240503085736.3354268-1-john.g.garry@oracle.com
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reported-by: Conor Dooley <conor@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: johnpgarry

.mailmap

@@ -292,6 +292,7 @@ Johan Hovold <johan@kernel.org> <jhovold@gmail.com>
 Johan Hovold <johan@kernel.org> <johan@hovoldconsulting.com>
 John Crispin <john@phrozen.org> <blogic@openwrt.org>
 John Fastabend <john.fastabend@gmail.com> <john.r.fastabend@intel.com>
+John Garry <john.g.garry@oracle.com> <john.garry@huawei.com>
 John Keeping <john@keeping.me.uk> <john@metanate.com>
 John Moon <john@jmoon.dev> <quic_johmoo@quicinc.com>
 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>