ARM: dts: stm32: add support for art-pi board based on stm32h750xbh6

This patchset has following changes:

- introduce stm32h750.dtsi to support stm32h750 value line
- add pin groups for usart3/uart4/spi1/sdmmc2
- add stm32h750i-art-pi.dtb (arch/arm/boot/dts/Makefile)
- add stm32h750i-art-pi.dts to support art-pi board
- add stm32h750i-art-pi-u-boot.dtsi to support art-pi board (u-boot)

art-pi board component:
- 8MiB qspi flash
- 16MiB spi flash
- 32MiB sdram
- ap6212 wifi&bt&fm

the detail board information can be found at:
https://art-pi.gitee.io/website/

Signed-off-by: dillon min <dillon.minfei@gmail.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index c671082..0f54801 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -454,7 +454,8 @@
 	stm32f769-disco.dtb \
 	stm32746g-eval.dtb
 dtb-$(CONFIG_STM32H7) += stm32h743i-disco.dtb \
-	stm32h743i-eval.dtb
+	stm32h743i-eval.dtb \
+	stm32h750i-art-pi.dtb
 
 dtb-$(CONFIG_MACH_SUN4I) += \
 	sun4i-a10-a1000.dtb \