MAINTAINERS: add xtensa irqchips to xtensa port entry

Now that irqchip drivers for xtensa live outside arch/xtensa we'd like
to add them to our maintenance list.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Marc Gauthier <marc@cadence.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 39f27f8..273fbd4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8765,6 +8765,7 @@
 L:	linux-xtensa@linux-xtensa.org
 S:	Maintained
 F:	arch/xtensa/
+F:	drivers/irqchip/irq-xtensa-*
 
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 M:	Hans Verkuil <hverkuil@xs4all.nl>