cmake: Log the project sdkconfig path as part of normal CMake status output
cmake: Log the project sdkconfig path as part of normal CMake status output

As discussed in footnote to https://github.com/espressif/esp-idf/issues/5251#issuecomment-625563782

espressif/esp-idf,espressif/esp-idf,espressif/esp-idf,espressif/esp-idf