LU-6215 build: announce linux kernel 4.4.6 support

LU-6215 build: announce linux kernel 4.4.6 support

Bump kernel version in ChangeLog to latest supported
kernel which is 4.4.6

Change-Id: I920e1139cc7abef82677e9ba79abfdc137dd205b
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: http://review.whamcloud.com/20543
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>