rpmsg: virtio: Register the rpmsg_char device

Instantiate the rpmsg_char device on virtio RPMsg bus creation.
This provides the capability, with the RPMSG_CREATE_EPT_IOCTL ioctl,
to create RPMsg char device endpoints relying on the
rpmsg_chrdev_create_eptdev API.

Notice that the created endpoints are attached to the rpmsg_ctldev
device, but not associated to a channel.
As consequence, the endpoint source and destination addresses have to
been specified and there is no channel creation and no name service
announcement to inform the remote side.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20210311140413.31725-6-arnaud.pouliquen@foss.st.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

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