ARM: stm32: Update dhelectronics/dh_stm32mp1/MAINTAINERS file

Adding new DH electronics mailing list.

Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/board/dhelectronics/dh_stm32mp1/MAINTAINERS b/board/dhelectronics/dh_stm32mp1/MAINTAINERS
index fd70131..9ce21c3 100644
--- a/board/dhelectronics/dh_stm32mp1/MAINTAINERS
+++ b/board/dhelectronics/dh_stm32mp1/MAINTAINERS
@@ -1,5 +1,6 @@
 DH_STM32MP1_PDK2 BOARD
 M:	Marek Vasut <marex@denx.de>
+L:	u-boot@dh-electronics.com
 S:	Maintained
 F:	arch/arm/dts/stm32mp15xx-dhcom*
 F:	board/dhelectronics/dh_stm32mp1/