MAINTAINERS: core DT include belongs to core

Signed-off-by: Wolfram Sang <wsa@kernel.org>

Author: wsakernel

MAINTAINERS

@@ -9268,6 +9268,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
 F:	Documentation/devicetree/bindings/i2c/i2c.txt
 F:	Documentation/i2c/
 F:	drivers/i2c/*
+F:	include/dt-bindings/i2c/i2c.h
 F:	include/linux/i2c-dev.h
 F:	include/linux/i2c-smbus.h
 F:	include/linux/i2c.h