boards: Convert nucleo_l073rz to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/nucleo_l073rz/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32 Nucleo-64 development board with STM32L073RZ MCU configuration
-
-# Copyright (c) 2018 Ilya Tagunov <tagunil@gmail.com>
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_NUCLEO_L073RZ
-	bool "NUCLEO-64 L073RZ Development Board"
-	depends on SOC_STM32L073XX

boards/st/nucleo_l073rz/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_NUCLEO_L073RZ
 
-config BOARD
-	default "nucleo_l073rz"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/st/nucleo_l073rz/Kconfig.nucleo_l073rz

@@ -0,0 +1,5 @@
+# Copyright (c) 2018 Ilya Tagunov <tagunil@gmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_L073RZ
+	select SOC_STM32L073XX

boards/st/nucleo_l073rz/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_l073rz
+  vendor: st
+  socs:
+    - name: stm32l073xx

boards/st/nucleo_l073rz/doc/index.rst

@@ -108,7 +108,7 @@ The Zephyr nucleo_l073rz board configuration supports the following hardware fea
 Other hardware features are not yet supported in this Zephyr port.
 
 The default configuration can be found in the defconfig file:
-``boards/arm/nucleo_l073rz/nucleo_l073rz_defconfig``
+:zephyr_file:`boards/st/nucleo_l073rz/nucleo_l073rz_defconfig`
 
 Connections and IOs
 ===================

boards/st/nucleo_l073rz/nucleo_l073rz_defconfig

@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32L0X=y
-
 # Platform Configuration
-CONFIG_SOC_STM32L073XX=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y