5a0fea6987
* [cpu] 增加ARCH_CPU_BIG_ENDIAN - 之前RT_USING_BIG_ENDIAN的命名并不合理,予以替换为ARCH_CPU_BIG_ENDIAN - 删除一处多余的ARCH_CPU_64BIT - 整理了libcpu/Kconfig的格式 * [libcpu][Kconfig] Cortex-M4&7 select ARCH_ARM_CORTEX_FPU * revert last commit