gpio_remove_raw_irq_handler_masked64() function

Removes a raw GPIO IRQ handler for the specified GPIOs on the current core In addition to the default mechanism of a single GPIO IRQ event callback per core (see gpio_set_irq_callback), it is possible to add explicit GPIO IRQ handlers which are called independent of the default event callback. This method removes such a callback, and enables the "default" callback for the specified GPIOs.