Add DT compatible string for DH electronics STM32MP15xx DHCOR on DRC Compact carrier board into YAML DT binding document. This system is a general purpose DIN Rail Controller design. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Patrick Delaunay <patrick.delaunay@st.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-arm-kernel@lists.infradead.org Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>