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

Add the file entry for include/dt-bindings/gpio to the appropriate
section in MAINTAINERS.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>