[SYCL][NATIVECPU] requesting ownership for libdevice/nativecpu* (#15142)

Requesting ownership for libdevice nativecpu files on behalf of
@intel/dpcpp-nativecpu-pi-reviewers. Thank you

Author: uwedolinsky

.github/CODEOWNERS

@@ -129,6 +129,7 @@ clang/test/Driver/sycl-native-cpu*.cpp @intel/dpcpp-nativecpu-pi-reviewers
 sycl/**/native_cpu/ @intel/dpcpp-nativecpu-pi-reviewers
 sycl/doc/design/SYCLNativeCPU.md @intel/dpcpp-nativecpu-pi-reviewers
 sycl/include/sycl/detail/native_cpu.hpp @intel/dpcpp-nativecpu-pi-reviewers
+libdevice/nativecpu* @intel/dpcpp-nativecpu-pi-reviewers
 
 # SYCL-Graphs extensions
 sycl/include/sycl/ext/oneapi/experimental/graph.hpp @intel/sycl-graphs-reviewers