boards: Convert b_l072z_lrwan1 to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/b_l072z_lrwan1/Kconfig.board

@@ -1,8 +0,0 @@
-# STMicroelectronics B-L072Z-LRWAN1 Discovery board configuration
-
-# Copyright (c) 2018 Aleksandr Makarov <aleksandr.o.makarov@gmail.com>
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_B_L072Z_LRWAN1
-	bool "STMicroelectronics B-L072Z-LRWAN1 Discovery kit"
-	depends on SOC_STM32L072XX

boards/boards_legacy/arm/b_l072z_lrwan1/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# STMicroelectronics B-L072Z-LRWAN1 Discovery board configuration
-
-# Copyright (c) 2018 Aleksandr Makarov <aleksandr.o.makarov@gmail.com>
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_B_L072Z_LRWAN1
-
-config BOARD
-	default "b_l072z_lrwan1"
-
-endif # BOARD_B_L072Z_LRWAN1

boards/st/b_l072z_lrwan1/Kconfig.b_l072z_lrwan1

@@ -0,0 +1,5 @@
+# Copyright (c) 2018 Aleksandr Makarov <aleksandr.o.makarov@gmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_B_L072Z_LRWAN1
+	select SOC_STM32L072XX

boards/st/b_l072z_lrwan1/b_l072z_lrwan1_defconfig

@@ -1,12 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32L0X=y
-
 # Platform Configuration
-CONFIG_SOC_STM32L072XX=y
-CONFIG_BOARD_B_L072Z_LRWAN1=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y
 

boards/st/b_l072z_lrwan1/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: b_l072z_lrwan1
+  vendor: st
+  socs:
+    - name: stm32l072xx

boards/st/b_l072z_lrwan1/doc/index.rst

@@ -147,7 +147,7 @@ The Zephyr B-L072Z-LRWAN1 Discovery board configuration supports the following h
 Other hardware features are not yet supported on this Zephyr port.
 
 The default configuration can be found in the defconfig file:
-``boards/arm/b_l072z_lrwan1/b_l072z_lrwan1_defconfig``
+:zephyr_file:`boards/st/b_l072z_lrwan1/b_l072z_lrwan1_defconfig`
 
 
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