initial tle_dring implementation

The Dynamic Ring (dring) is a implementation of unbounded FIFO queue,
that supports lockless bulk enqueue/dequeue for multiple producers/consumers.
Internally it contains producer/consumer head/tail indexes
(same as DPDK rte_ring), plus linked list of Dynamic Ring Blocks (drb)s.
Each drb contains some metadata plus array of pointers to queued objects.
It is a caller responsibility to provide sufficient number of drbs for
enqueue operation, and manage unused drbs returned by dequeue operation.
dring features:
- FIFO (First In First Out)
- Lockless implementation.
- Multi- or single-consumer dequeue.
- Multi- or single-producer enqueue.
- Bulk dequeue.
- Bulk enqueue.

Change-Id: I3621c99c6b114a387036a397e79baa8d1588bdb5
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

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