snippets: stm32: addition of video-stm32-jpegenc

Addition of a snippet in order to enable and configure the
STM32 JPEG encoder.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

snippets/stm32/video-stm32-jpegenc/README.rst

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+.. _snippet-video-stm32-jpegenc:
+
+STM32 Video JPEG encoder Snippet (video-stm32-jpegenc)
+######################################################
+
+.. code-block:: console
+
+   west build -S video-stm32-jpegenc [...]
+
+Overview
+********
+
+This snippet instantiate the STM32 JPEG encoder and set it
+as ``zephyr,videoenc`` :ref:`devicetree` chosen node.
+
+Requirements
+************
+
+The board must have the hardware support for the JPEG encoder.

snippets/stm32/video-stm32-jpegenc/snippet.yml

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+name: video-stm32-jpegenc
+append:
+  EXTRA_DTC_OVERLAY_FILE: video-stm32-jpegenc.overlay
+  EXTRA_CONF_FILE: video-stm32-jpegenc.conf
+

snippets/stm32/video-stm32-jpegenc/video-stm32-jpegenc.conf

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+# JPEG encoder output
+CONFIG_VIDEO_ENCODED_PIXEL_FORMAT="JPEG"
+
+# Default frame size
+CONFIG_VIDEO_FRAME_WIDTH=320
+CONFIG_VIDEO_FRAME_HEIGHT=240
+
+# JPEG encoder input
+CONFIG_VIDEO_PIXEL_FORMAT="NV12"

snippets/stm32/video-stm32-jpegenc/video-stm32-jpegenc.overlay

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+/*
+ * Copyright (c) 2025 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,videoenc = &jpeg;
+	};
+};
+
+&jpeg {
+	status = "okay";
+};