dt-bindings: media: imx-jpeg: Add compatible for i.MX8QM JPEG codec

Add two more compatibles: "nxp,imx8qm-jpgdec" and " nxp,imx8qm-jpgenc".
Also update the compatible property to ensure mutually exclusive usage of
encoder and decoder compatibles.
Update examples.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>