Test IIO rescale conversion functions

modulename: iio-test-rescale.ko

configname: CONFIG_IIO_RESCALE_KUNIT_TEST

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Test IIO rescale conversion functions
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Build unit tests for the iio-rescale code.

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to the KUnit documentation in
source code: