gpu: nvgpu: Remove redundant locked variable

gpu: nvgpu: Remove redundant locked variable

Queue locked variable holds entirely redundant information about the
queue status and having the variable causes a race between lock() and
unlock() functions. This patch removes the locked variable.

Bug 1495617

Change-Id: I05682bfe7a23acc77c2bfe405938ace7d2b3d081
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/393431
(cherry picked from commit d6fe45823ce0c63e103e619ece832909167f3bc5)
Reviewed-on: http://git-master/r/394903
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: David Dastous St Hilaire <ddastoussthi@nvidia.com>
Tested-by: Sang-Hun Lee <sanlee@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>