boards: Convert stm32h7b3i_dk to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/stm32h7b3i_dk/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32H7B3I Discovery kit board configuration
-
-# Copyright (c) 2022 Byte-Lab d.o.o. <dev@byte-lab.com>
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_STM32H7B3I_DK
-	bool "STM32H7B3I Discovery Kit Development Board"
-	depends on SOC_STM32H7B3XXQ

boards/st/stm32h7b3i_dk/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_STM32H7B3I_DK
 
-config BOARD
-	default "stm32h7b3i_dk"
-
 config INPUT
 	default y if LVGL
 

boards/st/stm32h7b3i_dk/Kconfig.stm32h7b3i_dk

@@ -0,0 +1,5 @@
+# Copyright (c) 2022 Byte-Lab d.o.o. <dev@byte-lab.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32H7B3I_DK
+	select SOC_STM32H7B3XXQ

boards/st/stm32h7b3i_dk/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: stm32h7b3i_dk
+  vendor: st
+  socs:
+    - name: stm32h7b3xx

boards/st/stm32h7b3i_dk/doc/index.rst

@@ -68,8 +68,8 @@ The current Zephyr stm32h7b3i_dk board configuration supports the following hard
 
 Other hardware features have not been enabled yet for this board.
 
-The default configuration per core can be found in the defconfig file:
-``boards/arm/stm32h7b3i_dk/stm32h7b3i_dk_defconfig``
+The default configuration can be found in the defconfig file:
+:zephyr_file:`boards/st/stm32h7b3i_dk/stm32h7b3i_dk_defconfig`
 
 Pin Mapping
 ===========

boards/st/stm32h7b3i_dk/stm32h7b3i_dk_defconfig

@@ -2,9 +2,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Set SoC present on the board
-CONFIG_SOC_SERIES_STM32H7X=y
-CONFIG_SOC_STM32H7B3XXQ=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y