MAINTAINERS: add include/dt-bindings/i2c to I2C SUBSYSTEM HOST DRIVERS

Maintainers of the directory Documentation/devicetree/bindings/i2c
are also the maintainers of the corresponding directory
include/dt-bindings/i2c.

Add the file entry for include/dt-bindings/i2c to the appropriate
section in MAINTAINERS.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

MAINTAINERS

@@ -9283,6 +9283,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
 F:	Documentation/devicetree/bindings/i2c/
 F:	drivers/i2c/algos/
 F:	drivers/i2c/busses/
+F:	include/dt-bindings/i2c/
 
 I2C-TAOS-EVM DRIVER
 M:	Jean Delvare <jdelvare@suse.com>