boards: Convert nucleo_h7a3zi_q to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/nucleo_h7a3zi_q/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32H7A3ZI-Q Nucleo board configuration
-
-# Copyright (c) 2021 Electrolance Solutions
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_NUCLEO_H7A3ZI_Q
-	bool "Nucleo H75A3ZI-Q Development Board"
-	depends on SOC_STM32H7A3XXQ

boards/st/nucleo_h7a3zi_q/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_NUCLEO_H7A3ZI_Q
 
-config BOARD
-	default "nucleo_h7a3zi_q"
-
 config USB_DC_HAS_HS_SUPPORT
 	default y
 	depends on USB_DC_STM32

boards/st/nucleo_h7a3zi_q/Kconfig.nucleo_h7a3zi_q

@@ -0,0 +1,5 @@
+# Copyright (c) 2021 Electrolance Solutions
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_H7A3ZI_Q
+	select SOC_STM32H7A3XXQ

boards/st/nucleo_h7a3zi_q/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_h7a3zi_q
+  vendor: st
+  socs:
+    - name: stm32h7a3xx

boards/st/nucleo_h7a3zi_q/doc/index.rst

@@ -115,7 +115,7 @@ features:
 Other hardware features are not yet supported on this Zephyr port.
 
 The default configuration can be found in the defconfig file:
-``boards/arm/nucleo_h7a3zi_q/nucleo_h7a3zi_q_defconfig``
+:zephyr_file:`boards/st/nucleo_h7a3zi_q/nucleo_h7a3zi_q_defconfig`
 
 For more details please refer to `STM32 Nucleo-144 board User Manual`_.
 

boards/st/nucleo_h7a3zi_q/nucleo_h7a3zi_q_defconfig

@@ -1,9 +1,6 @@
 # Copyright (c) 2021 Electrolance Solutions
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32H7X=y
-CONFIG_SOC_STM32H7A3XXQ=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y