[tty:tty-next 37/45] htmldocs: Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/mfd/atmel-usart.txt

[kernel test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-next
head:   adafbbf6895eb0ce41a313c6ee68870ab9aa93cd
commit: b9e947fbf008769ffda1028f627d604757e62265 [37/45] dt-bindings: serial: atmel,at91-usart: convert to json-schema
reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?id=b9e947fbf008769ffda1028f627d604757e62265
        git remote add tty https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
        git fetch --no-tags tty tty-next
        git checkout b9e947fbf008769ffda1028f627d604757e62265
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        make htmldocs

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/mfd/atmel-usart.txt

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