ark-update-configs.sh is confused when the same new config option is found in multiple Kconfig files
This can be seen in https://gitlab.com/cki-project/kernel-ark/-/jobs/4579399632
CONFIG_CXL_PMU was added to drivers/cxl/Kconfig and drivers/perf/Kconfig. We only need one MR for this but instead the script opens two MRs and they both propose creating an empty CONFIG file.