Test IIO formatting functions

modulename: iio-test-format.ko

configname: CONFIG_IIO_FORMAT_KUNIT_TEST

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Test IIO formatting functions
In linux kernel since version 6 (release Date: 2022-10-02)  
build unit tests for the IIO formatting functions.

For more information on KUnit and unit tests in general, please refer
to the KUnit documentation in
source code:
drivers/iio/test/iio-test-format.c