boards: Convert 96b_carbon to HWM v2

Port the board to HWMv2.

Signed-off-by: Abderrahmane Jarmouni <abderrahmane.jarmouni-ext@st.com>

boards/boards_legacy/arm/96b_carbon/Kconfig.board

@@ -1,8 +0,0 @@
-# 96boards Carbon STMF401RE board configuration
-
-# Copyright (c) 2016 Linaro Limited.
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_96B_CARBON
-	bool "96Boards Carbon (STM32F401)"
-	depends on SOC_STM32F401XE

boards/seeed/96b_carbon/96b_carbon_defconfig

@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32F4X=y
-CONFIG_SOC_STM32F401XE=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y
 

boards/seeed/96b_carbon/Kconfig.96b_carbon

@@ -0,0 +1,5 @@
+# Copyright (c) 2016 Linaro Limited.
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_96B_CARBON
+	select SOC_STM32F401XE

boards/seeed/96b_carbon/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_96B_CARBON
 
-config BOARD
-	default "96b_carbon"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/seeed/96b_carbon/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: 96b_carbon
+  vendor: seeed
+  socs:
+    - name: stm32f401xe