* fix android lint error in BaseLoaderCallback (LongLogTag)

Lint Error that was causde by the to long TAG:
BaseLoaderCallback.java:31:
Error: The logging tag can be at most 23 characters,
was 31 (OpenCVLoader/BaseLoaderCallback) [LongLogTag]
Log.e(TAG, "Package installation failed!");

* add requested "OCV" prefix for android logging