iio: trigger: drop generic interrupt trigger.

There is no way to bind to this driver from firmware and no explicit
platform device creation calls exist in mainline.

As such it is dead code. So drop it rather than potentially wasting time
modernizing it (see #1)

Link: https://lore.kernel.org/all/20260511063229.1433-1-sozdayvek@gmail.com/ #1
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: jic23

drivers/iio/trigger/Kconfig

@@ -16,15 +16,6 @@ config IIO_HRTIMER_TRIGGER
 	  To compile this driver as a module, choose M here: the
 	  module will be called iio-trig-hrtimer.
 
-config IIO_INTERRUPT_TRIGGER
-	tristate "Generic interrupt trigger"
-	help
-	  Provides support for using an interrupt of any type as an IIO
-	  trigger.  This may be provided by a gpio driver for example.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called iio-trig-interrupt.
-
 config IIO_STM32_LPTIMER_TRIGGER
 	tristate "STM32 Low-Power Timer Trigger"
 	depends on MFD_STM32_LPTIMER || COMPILE_TEST

drivers/iio/trigger/Makefile

@@ -6,7 +6,6 @@
 # When adding new entries keep the list in alphabetical order
 
 obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
-obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
 obj-$(CONFIG_IIO_STM32_LPTIMER_TRIGGER) += stm32-lptimer-trigger.o
 obj-$(CONFIG_IIO_STM32_TIMER_TRIGGER) += stm32-timer-trigger.o
 obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o