Revert "checkpatch: emit a warning on file add/move/delete"

This reverts commit 13f1937e
("checkpatch: emit a warning on file add/move/delete")
We do not use a maintainers file for tracking file owners/maintainers.
Remove this check.

Change-Id: If090c1c0b5fc16d87cd5342b57e3bdfde19a7fd4
Signed-off-by: Ian Maund <imaund@codeaurora.org>