boards: Convert stm32vl_disco to HWM v2

Port the board to HWMv2.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>

boards/arm/stm32vl_disco/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# Board configuration
-
-# Copyright (c) 2020 Jonas Eriksson, Up to Code AB
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_STM32VL_DISCO
-
-config BOARD
-	default "stm32vl_disco"
-
-endif # BOARD_STM32VL_DISCO

boards/v2/st/stm32vl_disco/Kconfig.stm32vl_disco

@@ -1,8 +1,5 @@
-# Board configuration
-
 # Copyright (c) 2020 Jonas Eriksson, Up to Code AB
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_STM32VL_DISCO
-	bool "STM32VLDISCOVERY Development Board"
-	depends on SOC_STM32F100XB
+	select SOC_STM32F100XB

boards/v2/st/stm32vl_disco/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: stm32vl_disco
+  vendor: st
+  socs:
+    - name: stm32f100xb

boards/v2/st/stm32vl_disco/stm32vl_disco_defconfig

@@ -1,9 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Platform Configuration
-CONFIG_SOC_SERIES_STM32F1X=y
-CONFIG_SOC_STM32F100XB=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y