boards/arm/mikroe_mini_m4_for_stm32: fix model&compatible dt properties

The mikroe_mini_m4_for_stm32 board is developed by Mikroelektronika
not by STMicroelectronics.
Also use more appropriate "mini-m4-for-stm32" board name for
compatible dt property.

Signed-off-by: Antony Pavlov <[email protected]>

Author: frantony

boards/arm/mikroe_mini_m4_for_stm32/mikroe_mini_m4_for_stm32.dts

@@ -8,8 +8,8 @@
 #include <st/f4/stm32f415Rg.dtsi>
 
 / {
-	model = "STMicroelectronics Mikroe MINI-M4 for STM32 board";
-	compatible = "st,stm32f415-mikroe-f415rg", "st,stm32f415";
+	model = "Mikroe MINI-M4 for STM32 board";
+	compatible = "mikroe,mini-m4-for-stm32", "st,stm32f415rg";
 
 	chosen {
 		zephyr,console = &usart2;