bitbake: fix removing all generated files before re-creating them

* without split() it was trying to remove all these files as one
  path in quotes and failing as shown after removing --ignore-unmatch

  git.exc.GitCommandError: Cmd('git') failed due to: exit code(128)
    cmdline: git rm -rf meta-ros2-eloquent/generated-recipes meta-ros2-eloquent/conf/ros-distro/include/eloquent/generated meta-ros2-eloquent/files/eloquent/generated/newer-platform-components.list meta-ros2-eloquent/files/eloquent/generated/rosdep-resolve.yaml meta-ros2-eloquent/files/eloquent/generated/superflore-change-summary.txt
    stderr: 'fatal: pathspec 'meta-ros2-eloquent/generated-recipes meta-ros2-eloquent/conf/ros-distro/include/eloquent/generated meta-ros2-eloquent/files/eloquent/generated/newer-platform-components.list meta-ros2-eloquent/files/eloquent/generated/rosdep-resolve.yaml meta-ros2-eloquent/files/eloquent/generated/superflore-change-summary.txt ' did not match any files'

  with split() it correctly complains only about superflore-change-summary.txt
  which will be fixed by returning --ignore-unmatch

  git.exc.GitCommandError: Cmd('git') failed due to: exit code(128)
    cmdline: git rm -rf meta-ros2-eloquent/generated-recipes meta-ros2-eloquent/conf/ros-distro/include/eloquent/generated meta-ros2-eloquent/files/eloquent/generated/newer-platform-components.list meta-ros2-eloquent/files/eloquent/generated/rosdep-resolve.yaml meta-ros2-eloquent/files/eloquent/generated/superflore-change-summary.txt
    stderr: 'fatal: pathspec 'meta-ros2-eloquent/files/eloquent/generated/superflore-change-summary.txt' did not match any files'

Signed-off-by: Martin Jansa <martin.jansa@lge.com>

superflore/generators/bitbake/ros_meta.py

@@ -45,7 +45,7 @@ def clean_ros_recipe_dirs(self, distro):
         info(
             'Cleaning up:\n{0}'
             .format(files))
-        self.repo.git.rm('-rf', '--ignore-unmatch', files)
+        self.repo.git.rm('-rf', '--ignore-unmatch', files.split())
 
     def commit_changes(self, distro, commit_msg):
         info('Commit changes...')