MAINTAINERS: add include/dt-bindings/reset path to reset controller entry

This is the path for reset definitions to be used in both device tree and
reset controller drivers.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index fd60784..e44c23f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8553,6 +8553,7 @@
 S:	Maintained
 F:	drivers/reset/
 F:	Documentation/devicetree/bindings/reset/
+F:	include/dt-bindings/reset/
 F:	include/linux/reset.h
 F:	include/linux/reset-controller.h