arm: soc: move arm SoCs to top-dir

Move the SoC outside of the architecture tree and put them at the same
level as boards and architectures allowing both SoCs and boards to be
maintained outside the tree.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

soc/arm/st_stm32/stm32f4/Kconfig.soc

@@ -0,0 +1,48 @@
+# Kconfig.soc - ST Microelectronics STM32F4 MCU line
+#
+# Copyright (c) 2016 Linaro Limited.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+choice
+prompt "STM32F4x MCU Selection"
+depends on SOC_SERIES_STM32F4X
+
+config SOC_STM32F401XE
+	bool "STM32F401XE"
+
+config SOC_STM32F405XG
+	bool "STM32F405XG"
+
+config SOC_STM32F407XG
+	bool "STM32F407XG"
+
+config SOC_STM32F411XE
+	bool "STM32F411XE"
+
+config SOC_STM32F412CG
+	bool "STM32F412CG"
+
+config SOC_STM32F412ZG
+	bool "STM32F412ZG"
+
+config SOC_STM32F413XH
+	bool "STM32F413XH"
+
+config SOC_STM32F417XE
+	bool "STM32F417XE"
+
+config SOC_STM32F417XG
+	bool "STM32F417XG"
+
+config SOC_STM32F429XI
+	bool "STM32F429XI"
+
+config SOC_STM32F446XE
+	bool "STM32F446XE"
+
+config SOC_STM32F469XI
+	bool "STM32F469XI"
+
+endchoice