boards: Convert nucleo_l152re to HWM v2

Port the board to HWMv2.

Signed-off-by: Abderrahmane Jarmouni <abderrahmane.jarmouni-ext@st.com>

boards/boards_legacy/arm/nucleo_l152re/Kconfig.defconfig

@@ -1,12 +0,0 @@
-#
-# Copyright (c) 2019 Antony Pavlov <antonynpavlov@gmail.com>
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-
-if BOARD_NUCLEO_L152RE
-
-config BOARD
-	default "nucleo_l152re"
-
-endif # BOARD_NUCLEO_L152RE

boards/st/nucleo_l152re/Kconfig.nucleo_l152re

@@ -1,9 +1,5 @@
-#
 # Copyright (c) 2019 Antony Pavlov <antonynpavlov@gmail.com>
-#
 # SPDX-License-Identifier: Apache-2.0
-#
 
 config BOARD_NUCLEO_L152RE
-	bool "NUCLEO-64 L152RE Development Board"
-	depends on SOC_STM32L152XE
+	select SOC_STM32L152XE

boards/st/nucleo_l152re/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_l152re
+  vendor: st
+  socs:
+    - name: stm32l152xe

boards/st/nucleo_l152re/nucleo_l152re_defconfig

@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32L1X=y
-CONFIG_SOC_STM32L152XE=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y