remoteproc: remove the single rpmsg vdev limitation

Now that the resource table supports publishing a virtio device
in a single resource entry, firmware images can start supporting
more than a single vdev.

This patch removes the single vdev limitation of the remoteproc
framework so multi-vdev firmwares can be leveraged: VDEV resource
entries are parsed when the rproc is registered, and as a result
their vrings are set up and the virtio devices are registered
(and they go away when the rproc goes away).

Moreover, we no longer only support VIRTIO_ID_RPMSG vdevs; any
virtio device type goes now. As a result, there's no more any
rpmsg-specific APIs or code in remoteproc: it all becomes generic
virtio handling.

Signed-off-by: Ohad Ben-Cohen <[email protected]>
Cc: Brian Swetland <[email protected]>
Cc: Iliyan Malchev <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Mark Grosen <[email protected]>
Cc: John Williams <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Loic PALLARDY <[email protected]>
Cc: Ludovic BARRE <[email protected]>
Cc: Omar Ramirez Luna <[email protected]>
Cc: Guzman Lugo Fernando <[email protected]>
Cc: Anna Suman <[email protected]>
Cc: Clark Rob <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: David Brown <[email protected]>
Cc: Kieran Bingham <[email protected]>
Cc: Tony Lindgren <[email protected]>

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