android: Add script to test simpleperf

Add script to test simpleperf. The script needs to be pushed
to /sdcard directory along with build env file on device and
run like below,

$ adb push files/android/test_simpleperf.sh /sdcard
$ adb push setup_build_env_* /sdcard/build_env.cfg
$ /system/bin/sh /sdcard/test_simpleperf.sh

Signed-off-by: Jagdish Gediya <jagdish.gediya@arm.com>