checkpatch: improve patch recognition

checkpatch: improve patch recognition

There are mode change and rename only patches that are unrecognized by
checkpatch.

Recognize them.

[[email protected]: fix missing close parenthesis]
Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/974a407e6fa18abd5a965da39cc68986a4c4f091.1526949367.git.joe@perches.com
Signed-off-by: Joe Perches <[email protected]>
Reported-by: Heinrich Schuchardt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>