CONFIG_IIO_TRIGGER is not available for the default architecture x86.
Result is shown for architecture avr32

Enable triggered sampling support


Linux Kernel Configuration
└─> Device Drivers
└─> Industrial I/O support
└─> Enable triggered sampling support

Provides IIO core support for triggers. Currently these
are used to initialize capture of samples to push into
buffers. The triggers are effectively a 'capture
data now' interrupt.