MAINTAINERS: Update STi and STM32 maintainers emails in remaining files

A previous series already update STMicroelectronics emails maintainers
but some files have been omitted (Makefile, .dts, .dtsi and .rst files).
Update Patrick and my email address with the one dedicated to upstream
activities.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/board/st/stm32f469-discovery/MAINTAINERS b/board/st/stm32f469-discovery/MAINTAINERS
index d3c791a..5a6a78b 100644
--- a/board/st/stm32f469-discovery/MAINTAINERS
+++ b/board/st/stm32f469-discovery/MAINTAINERS
@@ -1,5 +1,5 @@
 STM32F469-DISCOVERY BOARD
-M:	Patrice Chotard <patrice.chotard@st.com>
+M:	Patrice Chotard <patrice.chotard@foss.st.com>
 S:	Maintained
 F:	board/st/stm32f469-discovery/
 F:	include/configs/stm32f469-discovery.h