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.stm32f407xx

@@ -0,0 +1,38 @@
+# Kconfig - ST STM32F407XX MCU configuration options
+#
+# Copyright (c) 2016 Linaro Limited.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_STM32F407XG
+
+config SOC
+	string
+	default "stm32f407xx"
+
+config NUM_IRQS
+	int
+	default 82
+
+if GPIO_STM32
+
+config GPIO_STM32_PORTF
+	default y
+
+config GPIO_STM32_PORTG
+	default y
+
+config GPIO_STM32_PORTI
+	default y
+
+endif # GPIO_STM32
+
+if ENTROPY_GENERATOR
+
+config ENTROPY_STM32_RNG
+	def_bool y
+
+endif # ENTROPY_GENERATOR
+
+endif # SOC_STM32F407XG