boards: Convert b_g474e_dpow1 to HWM v2

Port the board to HWMv2.

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

boards/boards_legacy/arm/b_g474e_dpow1/Kconfig.board

@@ -1,8 +0,0 @@
-# B-G474E-DPOW1 Discovery board configuration
-
-# Copyright 2022 The Chromium OS Authors
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_B_G474E_DPOW1
-	bool "B-G474E-DPOW1 Discovery Board"
-	depends on SOC_STM32G474XX

boards/boards_legacy/arm/b_g474e_dpow1/Kconfig.defconfig

@@ -1,11 +0,0 @@
-# B-G474E-DPOW1 Discovery board configuration
-
-# Copyright 2022 The Chromium OS Authors
-# SPDX-License-Identifier: Apache-2.0
-
-if BOARD_B_G474E_DPOW1
-
-config BOARD
-	default "b_g474e_bpow1"
-
-endif # BOARD_B_G474E_DPOW1

boards/st/b_g474e_dpow1/Kconfig.b_g474e_dpow1

@@ -0,0 +1,5 @@
+# Copyright 2022 The Chromium OS Authors
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_B_G474E_DPOW1
+	select SOC_STM32G474XX

boards/st/b_g474e_dpow1/b_g474e_dpow1_defconfig

@@ -2,9 +2,6 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-CONFIG_SOC_SERIES_STM32G4X=y
-CONFIG_SOC_STM32G474XX=y
-
 # Serial Drivers
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y

boards/st/b_g474e_dpow1/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: b_g474e_dpow1
+  vendor: st
+  socs:
+    - name: stm32g474xx