Android utilities: fix cleanup operation

Ruslan Baratovrequested to merge
ruslo/cmake:pr.fix.android.cleanup into master

'su' is not available by default on all devices:

  > adb shell "echo ls /data/local/tmp | su"
  /system/bin/sh: su: not found
  > echo $?
  0

Also since execute_adb_command use execute_process under the hood the pipeline (|) will not be treated as special symbol and will be process just like one more command line argument for the adb.

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