Update Kconfig

bsp/stm32/libraries/Kconfig

@@ -40,7 +40,3 @@ config SOC_SERIES_STM32H7
     bool
     select ARCH_ARM_CORTEX_M7
     select SOC_FAMILY_STM32
-    
-config RT_USING_CPU_FFS
-    bool "Using CPU FFS"
-    default y