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.defconfig.stm32f412zg

@@ -0,0 +1,35 @@
+# Kconfig - ST STM32F412ZG MCU configuration options
+#
+# Copyright (c) 2017 Florian Vaussard, HEIG-VD
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_STM32F412ZG
+
+config SOC
+	string
+	default "stm32f412zx"
+
+config NUM_IRQS
+	int
+	default 97
+
+if GPIO_STM32
+
+config GPIO_STM32_PORTF
+	default y
+
+config GPIO_STM32_PORTG
+	default y
+
+endif # GPIO_STM32
+
+if ENTROPY_GENERATOR
+
+config ENTROPY_STM32_RNG
+	def_bool y
+
+endif # ENTROPY_GENERATOR
+
+endif # SOC_STM32F412ZG