boards: Convert stm32g0316_disco to HWM v2

Port the board to HWMv2.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>

boards/boards_legacy/arm/stm32g0316_disco/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32G0316 Discovery board configuration
-
-# Copyright (c) 2019 SEAL AG
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_STM32G0316_DISCO
-	bool "STM32G0316 Discovery Development Board"
-	depends on SOC_STM32G031XX

boards/boards_legacy/arm/stm32g0316_disco/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# STM32G0316 Discovery board configuration
-
-# Copyright (c) 2019 SEAL AG
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_STM32G0316_DISCO
-
-config BOARD
-	default "stm32g0316_disco"
-
-endif # BOARD_STM32G0316_DISCO

boards/st/stm32g0316_disco/Kconfig.stm32g0316_disco

@@ -0,0 +1,5 @@
+# Copyright (c) 2019 SEAL AG
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32G0316_DISCO
+	select SOC_STM32G031XX

boards/st/stm32g0316_disco/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: stm32g0316_disco
+  vendor: st
+  socs:
+    - name: stm32g031xx

boards/st/stm32g0316_disco/stm32g0316_disco_defconfig

@@ -1,7 +1,3 @@
-# Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32G0X=y
-CONFIG_SOC_STM32G031XX=y
-
 # Kernel Options due to Low Memory (8k)
 CONFIG_MAIN_STACK_SIZE=640
 CONFIG_IDLE_STACK_SIZE=200