boards: Convert nucleo_h723zg to HWM v2

Port the board to HWMv2.

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

boards/st/nucleo_h723zg/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_NUCLEO_H723ZG
 
-config BOARD
-	default "nucleo_h723zg"
-
 if NETWORKING
 
 config NET_L2_ETHERNET

boards/st/nucleo_h723zg/Kconfig.nucleo_h723zg

@@ -1,8 +1,5 @@
-# STM32H723ZG Nucleo board configuration
-
 # Copyright (c) 2020 Alexander Kozhinov <AlexanderKozhinov@yandex.com>
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_NUCLEO_H723ZG
-	bool "NUCLEO-H723ZG Development Board"
-	depends on SOC_STM32H723XX
+	select SOC_STM32H723XX

boards/st/nucleo_h723zg/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_h723zg
+  vendor: st
+  socs:
+    - name: stm32h723xx

boards/st/nucleo_h723zg/doc/index.rst

@@ -118,8 +118,8 @@ features:
 
 Other hardware features are not yet supported on this Zephyr port.
 
-The default configuration per core can be found in the defconfig files:
-``boards/arm/nucleo_h723zg/nucleo_h723zg_defconfig``
+The default configuration can be found in the defconfig files:
+:zephyr_file:`boards/st/nucleo_h723zg/nucleo_h723zg_defconfig``
 
 For more details please refer to `STM32 Nucleo-144 board User Manual`_.
 

boards/st/nucleo_h723zg/nucleo_h723zg_defconfig

@@ -1,10 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32H7X=y
-CONFIG_SOC_STM32H723XX=y
-
-CONFIG_BOARD_NUCLEO_H723ZG=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y