linux-headers: bump 4.{4, 9, 14, 15}.x series

[Peter: drop 4.14.x / 4.15.x bump]
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 2661d47425f866cf56617d2928b6b96566db8de4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
1 file changed