boards: Convert stm32f072b_disco to HWM v2

Port the board to HWMv2.

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

boards/arm/stm32f072b_disco/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32F072B-DISCO board configuration
-
-# Copyright (c) 2017 Clage GmbH
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_STM32F072B_DISCO
-	bool "STM32F072B-DISCO Development Board"
-	depends on SOC_STM32F072XB

boards/v2/st/stm32f072b_disco/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_STM32F072B_DISCO
 
-config BOARD
-	default "stm32f072b_disco"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/v2/st/stm32f072b_disco/Kconfig.stm32f072b_disco

@@ -0,0 +1,5 @@
+# Copyright (c) 2017 Clage GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32F072B_DISCO
+	select SOC_STM32F072XB

boards/v2/st/stm32f072b_disco/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: stm32f072b_disco
+  vendor: st
+  socs:
+    - name: stm32f072xb

boards/v2/st/stm32f072b_disco/stm32f072b_disco_defconfig

@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32F0X=y
-
 # Platform Configuration
-CONFIG_SOC_STM32F072XB=y
-
 # Serial Drivers
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y