Linux 4.4.73

BugLink: http://bugs.launchpad.net/bugs/1698817Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

Makefile

 VERSION = 4
 PATCHLEVEL = 4
-SUBLEVEL = 72
+SUBLEVEL = 73
 EXTRAVERSION =
 NAME = Blurry Fish Butt