Change the following memory hot-add error messages to info messages.
There is no need for these to be errors.

   kasan: WARNING: KASAN doesn't support memory hot-add
   kasan: Memory hot-add will be disabled

Link: http://lkml.kernel.org/r/1464794430-5486-1-git-send-email-shuahkh@osg.samsung.comSigned-off-by: NShuah Khan <shuahkh@osg.samsung.com>
Acked-by: NAndrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>