net/ixgbe: use write combining store for tail updates

net/ixgbe: use write combining store for tail updates

Performance improvement: use a write combining store
instead of a regular mmio write to update queue tail
registers.

Signed-off-by: Radu Nicolau <radu.nicolau@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Reviewed-by: Wenzhuo Lu <wenzhuo.lu@intel.com>