boards: Convert mikroe_mini_m4_for_stm32 to HWM v2

Port the board to HWMv2.

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

boards/mikroe/mikroe_mini_m4_for_stm32/Kconfig.defconfig

@@ -5,9 +5,6 @@
 
 if BOARD_MIKROE_MINI_M4_FOR_STM32
 
-config BOARD
-	default "mikroe_mini_m4_for_stm32"
-
 config SPI_STM32_INTERRUPT
 	default y
 	depends on SPI

boards/mikroe/mikroe_mini_m4_for_stm32/Kconfig.mikroe_mini_m4_for_stm32

@@ -1,8 +1,5 @@
-# Mikroe MINI-M4 for STM32 board configuration
-
 # Copyright (c) 2019, Kwon Tae-young <tykwon@m2i.co.kr>
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_MIKROE_MINI_M4_FOR_STM32
-	bool "Mikroe MINI-M4 for STM32 Board"
-	depends on SOC_STM32F415XX
+	select SOC_STM32F415XX

boards/mikroe/mikroe_mini_m4_for_stm32/board.yml

@@ -0,0 +1,5 @@
+board:
+  name: mikroe_mini_m4_for_stm32
+  vendor: mikroe
+  socs:
+    - name: stm32f415xx

boards/mikroe/mikroe_mini_m4_for_stm32/mikroe_mini_m4_for_stm32_defconfig

@@ -1,7 +1,3 @@
-CONFIG_BOARD_MIKROE_MINI_M4_FOR_STM32=y
-CONFIG_SOC_SERIES_STM32F4X=y
-CONFIG_SOC_STM32F415XX=y
-
 # Enable MPU
 CONFIG_ARM_MPU=y