OCL20: handle device enqueue in runtime.

There are some step to handle device enqueue:
1. allocate the device enqueue bo to store the device enqueue
information for parent kernel. Add must convert all global buffers to
SVM buffers to make sure the child kernels have the same GPU address.
2. When flush the command, check whether have device enqueue or not. If
has device enqueue, must wait finish and parse the device enqueue info.
3. Start the child ndrange according the device enqueue info, and the
parent's global buffers as the exec info.

Because of non uniform workgroup size, one enqueue api will flush
serveral times, but device enqueue only need handle once, so add a flag
to function cl_command_queue_flush to indicate the last flush.

Signed-off-by: Yang Rong <rong.r.yang@intel.com>
Reviewed-by: Pan Xiuli <xiuli.pan@intel.com>

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