Most device_id structs provide a driver_data field that can be used
by drivers to associate data more easily for a particular device ID.
Add the same for the rpmsg_device_id.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NStephan Gerhold <stephan@gerhold.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>