Add DT compatible string for Data Modul i.MX8M Mini eDM SBC board into YAML DT binding document. This system is an evaluation board for various custom display units. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Fabio Estevam <festevam@denx.de> Cc: Peng Fan <peng.fan@nxp.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Shawn Guo <shawnguo@kernel.org> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: devicetree@vger.kernel.org To: linux-arm-kernel@lists.infradead.org Reviewed-by: Peng Fan <peng.fan@nxp.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Shawn Guo <shawnguo@kernel.org>