remoteproc: imx_rproc: iterate all notifiyids in rx callback

The current code only supports one vdev and a single callback,
but there are cases need more vdevs. So iterate all notifyids to
support more vdevs with the single callback.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20230629093327.3376308-1-peng.fan@oss.nxp.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>