boards: Convert dragino_nbsn95 to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/dragino_nbsn95/Kconfig.board

@@ -1,8 +0,0 @@
-# Dragino NBSN95 NB-IoT Sensor Node board configuration
-
-# Copyright (c) 2021 Next Big Thing AG
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_DRAGINO_NBSN95
-	bool "Dragino NBSN95 Sensor Node"
-	depends on SOC_STM32L072XX

boards/boards_legacy/arm/dragino_nbsn95/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# Dragino NBSN95 NB-IoT Sensor Node board configuration
-
-# Copyright (c) 2021 Next Big Thing AG
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_DRAGINO_NBSN95
-
-config BOARD
-	default "dragino_nbsn95"
-
-endif # BOARD_DRAGINO_NBSN95

boards/dragino/dragino_nbsn95/Kconfig.dragino_nbsn95

@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Next Big Thing AG
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_DRAGINO_NBSN95
+	select SOC_STM32L072XX

boards/dragino/dragino_nbsn95/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: dragino_nbsn95
+  vendor: dragino
+  socs:
+    - name: stm32l072xx

boards/dragino/dragino_nbsn95/doc/index.rst

@@ -100,8 +100,7 @@ The Zephyr Dragino NBSN95 board configuration supports the following hardware fe
 Other hardware features are not yet supported on this Zephyr port.
 
 The default configuration can be found in the defconfig file:
-
-	``boards/arm/dragino_nbsn95/dragino_nbsn95_defconfig``
+:zephyr_file:`boards/dragino/dragino_nbsn95/dragino_nbsn95_defconfig`
 
 
 Connections and IOs

boards/dragino/dragino_nbsn95/dragino_nbsn95_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_DRAGINO_NBSN95=y
-
 # Serial Drivers
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y