watchdog: gemini/ftwdt010: rename DT bindings

The device tree bindings are in two copies and also should be
consolidated into a single Faraday Technology FTWDT010
binding since we uncovered that this IP part is a standard
IP from Faraday.

Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>