Enable logging for examples/Lightbulb

[cleobis]

Log messages in examples/Lightbulb/main/App.c using HAPLogInfo() are not displayed on the console. Log messages from inside the ADK are working correctly. It appears that HAP_LOG_LEVEL is not defined when compiling the example files and the default value of 0 from HAPLog.h is being used. Update examples/Lightbulb/main/CMakeLists.txt to set the log level based on the value from menuconfig.

This patch worked for me. I don't know enough about CMake to tell if this is the correct way to fix it.

[CLAassistant]

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[shahpiyushv]

@cleobis , thanks for this fix. It has now been merged.