Remove get_gradle_dependencies_list-android-components and get_gradle_dependencies_list-fenix makefile rules, and update doc/how-to-create-gradle-dependencies-list.txt

Projects android-components and fenix have been removed. However the get_gradle_dependencies_list-android-components and get_gradle_dependencies_list-fenix makefile rules which are no longer used are still there.

We should also remove them from doc/how-to-create-gradle-dependencies-list.txt.