Add direct drive network and inference creation

The NPU driver and driver library now supports creating network and
inferences instances for the direct drive setup. This is only the
initial support and it is not possible to run inferences yet.

Change-Id: Ib2888455ad081d0887013e351df2df87e44cd15a
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>