rtems目录清理

目标平台stm32f7

rtesm-4.11.3/cpukit/score/cpu,只保留arm
rtesm-4.11.3/c/src/lib/libcpu,只保留arm和shared
rtesm-4.11.3/c/src/lib/libcpu/arm, 只保留shared
rtesm-4.11.3/c/src/lib/libbsp,只保留arm和shared
rtesm-4.11.3/c/src/lib/libbsp/arm,只保留stm32f4和shared