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>

MAINTAINERS

@@ -8553,6 +8553,7 @@ M:	Philipp Zabel <p.zabel@pengutronix.de>
 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