dt-bindings: reset: mt7986: Add reset-controller header file

Add infracfg, toprgu, and ethsys reset-controller header file
for MT7986 platform.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220105100456.7126-2-sam.shih@mediatek.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>