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Devices: Ensure IRQn_Type enum size matches maximum value
This change fixes a bug where a compiler choses a signed byte to store the IRQn_Type enum type as all listed enum values fit a signed byte. This causes undefined behavior when calling functions such as NVIC_EnableIRQ with interrupt channels greater than 127 as these do not fit a signed byte. As a result, interrupt channels higher than 127 cannot be enabled, disabled, or triggered. Fix this by listing the highest possible interrupt channel in each enum declaration which ensures that a storage type is chosen that can accommodate all valid interrupt channels. Tested on a MEC1527 devices by triggering interrupt channel 171 (watchdog) and observing that the ISR is executed.
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