dt-bindings: watchdog: starfive,jh7100-wdt: Add compatible for JH8100

Add "starfive,jh8100-wdt" compatible string for StarFive's JH8100
watchdog.
Since JH8100 watchdog only has 1 reset signal, update binding
document to support one reset for "starfive,jh8100-wdt" compatible.

Signed-off-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231221084358.3458713-2-jisheng.teoh@starfivetech.com


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