boards: Convert nucleo_f091rc to HWM v2

Port the board to HWMv2.

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

boards/arm/nucleo_f091rc/Kconfig.board

@@ -1,8 +0,0 @@
-# STM32 Nucleo-64 development board with STM32F091RC MCU configuration
-
-# Copyright (c) 2017 Bobby Noelte
-# SPDX-License-Identifier: Apache-2.0
-
-config BOARD_NUCLEO_F091RC
-	bool "NUCLEO-64 F091RC Development Board"
-	depends on SOC_STM32F091XC

boards/v2/st/nucleo_f091rc/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_NUCLEO_F091RC
 
-config BOARD
-	default "nucleo_f091rc"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/v2/st/nucleo_f091rc/Kconfig.nucleo_f091rc

@@ -0,0 +1,5 @@
+# Copyright (c) 2017 Bobby Noelte
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_F091RC
+	select SOC_STM32F091XC

boards/v2/st/nucleo_f091rc/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: nucleo_f091rc
+  vendor: st
+  socs:
+    - name: stm32f091xc

boards/v2/st/nucleo_f091rc/nucleo_f091rc_defconfig

@@ -1,11 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Zephyr Kernel Configuration
-CONFIG_SOC_SERIES_STM32F0X=y
-
 # Platform Configuration
-CONFIG_SOC_STM32F091XC=y
-
 # Serial Drivers
 CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y