boards: Convert sensortile_box to HWM v2

Port the board to HWMv2.

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

boards/st/sensortile_box/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_SENSORTILE_BOX
 
-config BOARD
-	default "sensortile_box"
-
 if BT
 
 config SPI

boards/st/sensortile_box/Kconfig.sensortile_box

@@ -1,8 +1,5 @@
-# SensorTile.box board configuration
-
 # Copyright (c) 2019 STMicroelectronics
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_SENSORTILE_BOX
-	bool "SensorTile.box Development Board"
-	depends on SOC_STM32L4R9XX
+	select SOC_STM32L4R9XX

boards/st/sensortile_box/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: sensortile_box
+  vendor: st
+  socs:
+    - name: stm32l4r9xx

boards/st/sensortile_box/sensortile_box_defconfig

@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32L4X=y
-CONFIG_SOC_STM32L4R9XX=y
-
 # enable uart driver
 CONFIG_SERIAL=y