MAINTAINERS: update faraday,ftrtc010.yaml reference

Changeset 8df65d4a ("dt-bindings: convert rtc/faraday,ftrtc01 to yaml")
renamed: Documentation/devicetree/bindings/rtc/faraday,ftrtc010.txt
to: Documentation/devicetree/bindings/rtc/faraday,ftrtc010.yaml.

Update its cross-reference accordingly.

Fixes: 8df65d4a ("dt-bindings: convert rtc/faraday,ftrtc01 to yaml")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/56737d183299294c840c8308c1427c3385d88a1e.1634630486.git.mchehab+huawei@kernel.org