ARM: DTS: add STM32F469 Discovery board support

This DT file comes from kernel v4.15-rc1

stm32f469-pinctrl.dtsi header has been updated with correct
STMicroelectronics Copyright.

Remove the paragraph about writing to the Free Software
Foundation's mailing address as requested by checkpatch.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 2c88f18..f10482e 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -213,7 +213,8 @@
 
 dtb-$(CONFIG_ARCH_SNAPDRAGON) += dragonboard410c.dtb
 
-dtb-$(CONFIG_STM32F4) += stm32f429-disco.dtb
+dtb-$(CONFIG_STM32F4) += stm32f429-disco.dtb \
+	stm32f469-disco.dtb
 
 dtb-$(CONFIG_STM32F7) += stm32f746-disco.dtb \
 	stm32f769-disco.dtb