MAINTAINERS: add Masami as a reviewer of hung task detector

Since I'm actively working on hung task blocker detector, add myself to a
reviewer of the HUNG TASK DETECTOR feature.

Link: https://lkml.kernel.org/r/175388550841.627474.3260499035226455392.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Acked-by: Lance Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: mhiramat

MAINTAINERS

@@ -11438,6 +11438,7 @@ F:	drivers/tty/hvc/
 HUNG TASK DETECTOR
 M:	Andrew Morton <[email protected]>
 R:	Lance Yang <[email protected]>
+R:	Masami Hiramatsu <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	include/linux/hung_task.h