MAINTAINERS: Update John Garry's email address for arm64 perf tooling

Update my address.
Signed-off-by: John Garry <john.g.garry@oracle.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20221121113018.1899426-1-john.g.garry@oracle.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

MAINTAINERS

@@ -16200,7 +16200,7 @@ F:	tools/lib/perf/
 F:	tools/perf/
 
 PERFORMANCE EVENTS TOOLING ARM64
-R:	John Garry <john.garry@huawei.com>
+R:	John Garry <john.g.garry@oracle.com>
 R:	Will Deacon <will@kernel.org>
 R:	James Clark <james.clark@arm.com>
 R:	Mike Leach <mike.leach@linaro.org>