commit e82b9b0727ff ("vhost: introduce vhost_exceeds_weight()")

Complete backport of vhost_exceeds_weight to android-4.4-p

Test: Compiles
Bug: 143972019
Change-Id: Ifafc3321332d9033be75123e761d7da7d8586e4c
Signed-off-by: Cody Schuffelen <schuffelen@google.com>