GBE: fixed a barrier related bug.

GBE: fixed a barrier related bug.

Actually, this commit fixed two bugs related to barrier.
1. We should set useSLM to true if we use barrier.
2. We need to set barrier id to the barrierMsg payload according to
r0.2. And we don't need to reprogram the barrierCount.

And after this fix, we don't need the work around for the local
memory barrier, thus we don't need the memory fence for local memory
barrier.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
Reviewed-by: Zou, Nanhai <nanhai.zou@intel.com>
Reviewed-by: Yang, Rong R <rong.r.yang@intel.com>
Tested-by: Sun, Yi <yi.sun@intel.com>