boards: Convert nucleo_wb55rg to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/nucleo_wb55rg/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32WB55RG Nucleo board configuration
-
-# Copyright (c) 2019 Linaro Limited
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_NUCLEO_WB55RG
-	bool "Nucleo WB55RG Development Board"
-	depends on SOC_STM32WB55XX

boards/boards_legacy/arm/nucleo_wb55rg/Kconfig.defconfig

@@ -1,16 +0,0 @@
-# STM32LWB55RG Nucleo board configuration
-
-# Copyright (c) 2019 Linaro Limited
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_NUCLEO_WB55RG
-
-config BOARD
-	default "nucleo_wb55rg"
-
-choice BT_HCI_BUS_TYPE
-	default BT_STM32_IPM
-	depends on BT
-endchoice
-
-endif # BOARD_NUCLEO_WB55RG

boards/st/nucleo_wb55rg/Kconfig.nucleo_wb55rg

@@ -0,0 +1,5 @@
+# Copyright (c) 2019 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_WB55RG
+	select SOC_STM32WB55XX

boards/st/nucleo_wb55rg/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_wb55rg
+  vendor: st
+  socs:
+    - name: stm32wb55xx

boards/st/nucleo_wb55rg/doc/nucleo_wb55rg.rst

@@ -177,7 +177,7 @@ The Zephyr nucleo_wb55rg board configuration supports the following hardware fea
 Other hardware features are not yet supported on this Zephyr port.
 
 The default configuration can be found in the defconfig file:
-``boards/arm/nucleo_wb55rg/nucleo_wb55rg_defconfig``
+:zephyr_file:`boards/st/nucleo_wb55rg/nucleo_wb55rg_defconfig`
 
 Bluetooth and compatibility with STM32WB Copro Wireless Binaries
 ================================================================

boards/st/nucleo_wb55rg/nucleo_wb55rg_defconfig

@@ -1,6 +1,3 @@
-CONFIG_SOC_SERIES_STM32WBX=y
-CONFIG_SOC_STM32WB55XX=y
-
 # enable uart driver
 CONFIG_SERIAL=y