samples: drivers: clock control: add sample

This adds a sample application for testing
the LiteX clock control driver.

Signed-off-by: Pawel Czarnecki <pczarnecki@internships.antmicro.com>
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
diff --git a/CODEOWNERS b/CODEOWNERS
index b79c90c..f464a72 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -450,6 +450,7 @@
 /samples/boards/intel_s1000_crb/          @sathishkuttan @dcpleung @nashif
 /samples/display/                         @vanwinkeljan
 /samples/drivers/can/                     @alexanderwachter
+/samples/drivers/clock_control_litex/     @mateusz-holenko @kgugala @pgielda
 /samples/drivers/display/                 @vanwinkeljan
 /samples/drivers/ht16k33/                 @henrikbrixandersen
 /samples/drivers/lora/                    @Mani-Sadhasivam