dt-bindings: remoteproc: imx_rproc: add i.MX8MQ/M support

Add i.MX8MQ/M support, also include mailbox for rpmsg/virtio usage.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/1615029865-23312-3-git-send-email-peng.fan@oss.nxp.com


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