input: misc: inv: prevent IRQ revival

input: misc: inv: prevent IRQ revival

Problem description:
 - nvi_work_function may revive IRQ which was disabled
   during suspend and shutdown

Fix description:
 - Add a flag stop_workqueue which is set during suspend
   and shutdown
 - If the flag is set, make workqueue not revive the IRQ

Bug 1361923

Change-Id: I498091602ef9c43b75c0a17d7fe0837624271959
Signed-off-by: Sang-Hun Lee <sanlee@nvidia.com>
Reviewed-on: http://git-master/r/284347
Reviewed-on: http://git-master/r/330860
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Robert Collins <rcollins@nvidia.com>
Reviewed-by: Erik Lilliebjerg <elilliebjerg@nvidia.com>
Reviewed-by: Mitch Luban <mluban@nvidia.com>