flounder: merging rpc client with a binding layer

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>

Adapted the DMA driver registratoin to register directly with the Nameservice when running on Xeon Phi instead talking to the manager.

libdma: refactoring of driver client as a "virtual" dma device

The DMA clients are now acting as a "normal" dma device where the
requests are forwared to the DMA driver service domain instead of
serving locally. The client initializes a DMA device by service name,
iref or supported memory range.

Extended the DMA manager to serve iref based queries.

Several generalizations of some device/channel functions to handle the
requests and forward them to the specific functions.

Adapted the dma_test domain to use the new interface.

DMA Manager: missing implementations and bugfixes in existing code (sendqueue)

LIBDMA: Added DMA Manager domain.