MAINTAINERS: i2c: mark also subdirectories as maintained

Otherwise get_maintainer.pl will fall back to git history and CC
more people than needed.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Lee Jones <lee.jones@linaro.org>

MAINTAINERS

@@ -5090,6 +5090,7 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/i2c/
 F:	Documentation/i2c/
 F:	drivers/i2c/
+F:	drivers/i2c/*/
 F:	include/linux/i2c.h
 F:	include/linux/i2c-*.h
 F:	include/uapi/linux/i2c.h