boards: Convert disco_l475_iot1 to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/disco_l475_iot1/Kconfig.board

@@ -1,8 +0,0 @@
-# Discovery IoT L475 board configuration
-
-# Copyright (c) 2017 Linaro Limited
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_DISCO_L475_IOT1
-	bool "Discovery IoT L475 Development Board"
-	depends on SOC_STM32L475XX

boards/st/disco_l475_iot1/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_DISCO_L475_IOT1
 
-config BOARD
-	default "disco_l475_iot1"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/st/disco_l475_iot1/Kconfig.disco_l475_iot1

@@ -0,0 +1,5 @@
+# Copyright (c) 2017 Linaro Limited
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_DISCO_L475_IOT1
+	select SOC_STM32L475XX

boards/st/disco_l475_iot1/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: disco_l475_iot1
+  vendor: st
+  socs:
+    - name: stm32l475xx

boards/st/disco_l475_iot1/disco_l475_iot1_defconfig

@@ -1,9 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_BOARD_DISCO_L475_IOT1=y
-CONFIG_SOC_SERIES_STM32L4X=y
-CONFIG_SOC_STM32L475XX=y
-
 # enable uart driver
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y

boards/st/disco_l475_iot1/doc/index.rst

@@ -136,7 +136,7 @@ Other hardware features are not yet supported on this Zephyr port.
 
 The default configuration can be found in the defconfig file:
 
-	``boards/arm/disco_l475_iot1/disco_l475_iot1_defconfig``
+	``boards/st/disco_l475_iot1/disco_l475_iot1_defconfig``
 
 
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