Linux 4.4.138

BugLink: https://bugs.launchpad.net/bugs/1777389Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

Makefile

 VERSION = 4
 PATCHLEVEL = 4
-SUBLEVEL = 137
+SUBLEVEL = 138
 EXTRAVERSION =
 NAME = Blurry Fish Butt