dt-bindings: irqchip: sti: remove stih415/stih416 and stid127

Remove bindings for the stih415/stih416/stid127 since they are
not supported within the kernel anymore.

Signed-off-by: Alain Volmat <avolmat@me.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230416190950.18929-1-avolmat@me.com


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