androiddevicestarget: Support an init silent mode
androiddevicestarget: Support an init silent mode

 * Required to define the target variable first

Change-Id: Ice872c7f583ffb81fc7e1de4ee9f65ad0a68e679
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools