HID Device role API fixes

This change makes HIDD API more like the other ones, i.e.
supporting multiple devices, and implements missing methods.

While the underlying implementation may still only support a
single device at a time, the "device" parameter can still be
useful for checking if the application is trying to send the
data to a correct device.

Test: make
Change-Id: I55fe04c0762a96fcddd6c6678e790361d648111a