remoteproc: imx_rproc: move memory parsing to rproc_ops

Use the rproc_ops::prepare() hook for doing memory resources
reallocation when reattaching a remote procesor.

Suggested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/1617846289-13496-4-git-send-email-peng.fan@oss.nxp.com


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