doc: cmd: Document remoteproc usage

Add documentation for rproc cmd usage.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/doc/usage/cmd/rproc.rst b/doc/usage/cmd/rproc.rst
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+.. SPDX-License-Identifier: GPL-2.0+
+   Copyright 2025 NXP
+   Written by Peng Fan <peng.fan@nxp.com>
+
+remoteproc command
+==================
+
+Synopsis
+--------
+
+::
+
+    rproc init <id>
+    rproc list
+    rproc load <id> [addr] [size]
+    rproc start <id>
+    rproc stop <id>
+    rproc reset <id>
+    rproc is_running <id>
+    rproc ping <id>
+
+Description
+-----------
+
+The rproc command provides a generic U-Boot mechanism to manage the Remote
+Processors inside a SoC .
+
+The 'rproc init' command enumerate and initialize the remote processor.
+
+    id
+        remote processor id. if id is not passed, initialize all the
+        remote prcessors
+
+The 'rproc list' list available remote processors.
+
+The 'rproc load' load the remote processor with binary.
+
+    id
+        remote processor id.
+    addr
+        address that image is loaded at.
+    size
+        image size
+
+The 'rproc start' start the remote processor(must be loaded).
+
+    id
+        remote processor id.
+
+The 'rproc stop' stop the remote processor.
+
+    id
+        remote processor id.
+
+The 'rproc reset' reset the remote processor.
+
+    id
+        remote processor id.
+
+The 'rproc is_running' reports if the remote processor is running.
+
+    id
+        remote processor id.
+
+The 'rproc ping' ping the remote processor for communication.
+
+    id
+        remote processor id.
+
+Configuration
+-------------
+
+The rproc command is only available if CONFIG_CMD_REMOTEPROC=y.
+
+.. toctree::
+   :maxdepth: 2
+
+   ../../board/nxp/rproc.rst