dt-bindings: reset: Convert Broadcom STB reset to YAML

Convert the Broadcom STB SW_INIT style reset controller binding to YAML.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20211208003727.3596577-3-f.fainelli@gmail.com


Signed-off-by: Rob Herring <robh@kernel.org>