dt-bindings: reset: remove stih415/stih416 reset

Remove the stih415 and stih416 reset dt-bindings since those
two platforms are no more supported.

Signed-off-by: Alain Volmat <avolmat@me.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230416200442.61554-1-avolmat@me.com
Signed-off-by: Rob Herring <robh@kernel.org>

Author: Alain Volmat