boards: Convert stm32f0_disco to HWM v2

Port the board to HWMv2.

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

boards/arm/stm32f0_disco/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32F0DISCOVERY development board with STM32F051R8 MCU configuration
-
-# Copyright (c) 2018 Nathan Tsoi <nathan@vertile.com>
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_STM32F0_DISCO
-	bool "STM32F0DISCOVERY Development Board"
-	depends on SOC_STM32F051X8

boards/arm/stm32f0_disco/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# STM32F0 development board with STM32F051R8T6 MCU
-
-# Copyright (c) 2018 Nathan Tsoi <nathan@vertile.com>
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_STM32F0_DISCO
-
-config BOARD
-	default "stm32f0_disco"
-
-endif # BOARD_STM32F0_DISCO

boards/v2/st/stm32f0_disco/Kconfig.stm32f0_disco

@@ -0,0 +1,5 @@
+# Copyright (c) 2018 Nathan Tsoi <nathan@vertile.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32F0_DISCO
+	select SOC_STM32F051X8

boards/v2/st/stm32f0_disco/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: stm32f0_disco
+  vendor: st
+  socs:
+    - name: stm32f051x8

boards/v2/st/stm32f0_disco/stm32f0_disco_defconfig

@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32F0X=y
-
 # Platform Configuration
-CONFIG_SOC_STM32F051X8=y
-
 # Kernel Options due to Low Memory (8k)
 CONFIG_MAIN_STACK_SIZE=640
 CONFIG_IDLE_STACK_SIZE=200