MAINTAINERS: add reset controller framework keywords

Add a regex that matches users of the reset controller API.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

MAINTAINERS

@@ -13851,6 +13851,7 @@ F:	include/dt-bindings/reset/
 F:	include/linux/reset.h
 F:	include/linux/reset/
 F:	include/linux/reset-controller.h
+K:      \b(?:devm_|of_)?reset_control(?:ler_[a-z]+|_[a-z_]+)?\b
 
 RESTARTABLE SEQUENCES SUPPORT
 M:	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>