boards: Convert sensortile_box_pro to HWM v2

Port the board to HWMv2.

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

boards/st/sensortile_box_pro/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_SENSORTILE_BOX_PRO
 
-config BOARD
-	default "sensortile_box_pro"
-
 if BT
 
 config SPI

boards/st/sensortile_box_pro/Kconfig.sensortile_box_pro

@@ -1,8 +1,5 @@
-# SENSORTILE_BOX_PRO board configuration
-
 # Copyright (c) 2023 STMicroelectronics
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_SENSORTILE_BOX_PRO
-	bool "SENSORTILE_BOX_PRO Board"
-	depends on SOC_STM32U585XX
+	select SOC_STM32U585XX

boards/st/sensortile_box_pro/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: sensortile_box_pro
+  vendor: st
+  socs:
+    - name: stm32u585xx

boards/st/sensortile_box_pro/doc/index.rst

@@ -225,13 +225,13 @@ There are two possible options for Zephyr console output:
   To enable console and shell over UART
 
   - switch the console lines from cdc_acm to uart4
-    (:file:`boards/arm/sensortile_box_pro/sensortile_box_pro.dts`)
+    (:file:`boards/st/sensortile_box_pro/sensortile_box_pro.dts`)
 
   - comment out the USB configuration macros
-    (:file:`boards/arm/sensortile_box_pro/sensortile_box_pro_defconfig`)
+    (:file:`boards/st/sensortile_box_pro/sensortile_box_pro_defconfig`)
 
 .. code-block:: dts
-   :caption: boards/arm/sensortile_box_pro/sensortile_box_pro.dts
+   :caption: boards/st/sensortile_box_pro/sensortile_box_pro.dts
 
    / {
        chosen {
@@ -243,7 +243,7 @@ There are two possible options for Zephyr console output:
      };
 
 .. code-block:: Kconfig
-   :caption: boards/arm/sensortile_box_pro/sensortile_box_pro_defconfig
+   :caption: boards/st/sensortile_box_pro/sensortile_box_pro_defconfig
 
    # Comment out following USB config lines when
    # switching console to UART
@@ -258,7 +258,7 @@ There are two possible options for Zephyr console output:
 - through USB as USB CDC/ACM class. This is the default case present in the board dts file.
 
 .. code-block:: dts
-   :caption: boards/arm/sensortile_box_pro/sensortile_box_pro.dts
+   :caption: boards/st/sensortile_box_pro/sensortile_box_pro.dts
 
    / {
        chosen {

boards/st/sensortile_box_pro/sensortile_box_pro_defconfig

@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32U5X=y
-CONFIG_SOC_STM32U585XX=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y