message: Remove unused CMSIS tag in readme
diff: @@ -527,7 +527,7 @@ auto-generated for any target you can compile using the main Make system, using
  a command like this:
  ```
  -make -f tensorflow/lite/experimental/micro/tools/make/Makefile TARGET=mbed TAGS="CMSIS disco_f746ng" generate_micro_speech_mbed_project
  +make -f tensorflow/lite/experimental/micro/tools/make/Makefile TARGET=mbed TAGS="disco_f746ng" generate_micro_speech_mbed_project
  ```
  This will create a folder in
  