MAINTAINERS: rectify entry in ARM SMC WATCHDOG DRIVER

Commit 5c24a28b ("dt-bindings: watchdog: Add ARM smc wdt for mt8173
watchdog") added the new ARM SMC WATCHDOG DRIVER entry in MAINTAINERS, but
slipped in a minor mistake.

Luckily, ./scripts/get_maintainer.pl --self-test=patterns complains:

  warning: no file matches F: devicetree/bindings/watchdog/arm-smc-wdt.yaml

Update file entry to intended file location.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Evan Benn <evanbenn@chromium.org>
Link: https://lore.kernel.org/r/20200602052104.7795-1-lukas.bulwahn@gmail.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>