perf tools: Add Adrian Hunter to MAINTAINERS as a reviewer

Adrian is the main author of the Intel PT codebase and has been
reviewing perf tooling patches consistently for a long time, so lets
reflect that in the MAINTAINERS file so that contributors add him to the
CC list in patch submissions.

Acked-by: Adrian Hunter <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: acmel

MAINTAINERS

@@ -16425,6 +16425,7 @@ R:	Alexander Shishkin <[email protected]>
 R:	Jiri Olsa <[email protected]>
 R:	Namhyung Kim <[email protected]>
 R:	Ian Rogers <[email protected]>
+R:	Adrian Hunter <[email protected]>
 L:	[email protected]
 L:	[email protected]
 S:	Supported