linux-imx

rpmsg: Name rpmsg devices based on channel id

By basing rpmsg device names on channel id we end up with human readable
device names in sysfs and debug logs.

Reviewed-by: Sarangdhar Joshi <spjoshi@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>