dt-bindings: power: reset: qcom: Add resin binding

Resin is similar to pwrkey, add the description and example
for resin bindings

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>