noninteractive-tradefed: stop using the latest adb

instead using the default version in the system,
either installed by the user manually or installed
inside some docker image, to avoid confusions caused by
unmanaged adb versions, like the "ADB server didn't ACK"
issue with the current latest adb version(platform-tools r35)
reported here:
https://lkft.validation.linaro.org/scheduler/job/7266683#L15671

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>

Author: liuyq

automated/android/noninteractive-tradefed/setup.sh

@@ -22,7 +22,6 @@ case "${dist}" in
         ;;
 esac
 
-install_latest_adb
 initialize_adb
 adb_root