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/arch/arm/dts/stm32f429-disco-u-boot.dtsi b/arch/arm/dts/stm32f429-disco-u-boot.dtsi
index df99e01..297cc56 100644
--- a/arch/arm/dts/stm32f429-disco-u-boot.dtsi
+++ b/arch/arm/dts/stm32f429-disco-u-boot.dtsi
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
- * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
+ * Author(s): Patrice Chotard, <patrice.chotard@foss.st.com> for STMicroelectronics.
  */
 
 #include <dt-bindings/memory/stm32-sdram.h>