[CODEOWNERS] Add one mode code owner for ESIMD runtime library (#4349)

Author: DenisBakhvalov

.github/CODEOWNERS

@@ -99,10 +99,10 @@ clang/tools/clang-offload-deps/ @sndmitriev @mlychkov @AlexeySachkov
 clang/tools/clang-offload-extract/ @sndmitriev @mlychkov @AlexeySachkov
 
 # Explicit SIMD
-SYCLLowerIR/ @kbobrovs @DenisBakhvalov
-esimd/ @kbobrovs @DenisBakhvalov
-sycl/include/sycl/ext/intel/experimental/esimd.hpp @kbobrovs @DenisBakhvalov
-sycl/doc/extensions/ExplicitSIMD/ @kbobrovs
+SYCLLowerIR/ @kbobrovs @DenisBakhvalov @kychendev
+esimd/ @kbobrovs @DenisBakhvalov @kychendev
+sycl/include/sycl/ext/intel/experimental/esimd.hpp @kbobrovs @DenisBakhvalov @kychendev
+sycl/doc/extensions/ExplicitSIMD/ @kbobrovs @DenisBakhvalov @kychendev
 
 # ITT annotations
 llvm/lib/Transforms/Instrumentation/SPIRITTAnnotations.cpp @MrSidims @vzakhari