Sane parameters for node and driver vendor_passthru()

The vendor_passthru() method for the node and driver library was
expecting a **kwargs, that isn't helpful because you don't know exactly
how much parameters it expects, what are the parameters etc... This
patch is changing it since the parameters are well defined (we knew what
parameters we were expecting there).

Change-Id: Idb2002eb76e76f6e1b67a6ea1a7d31f41573abdd