Android: Use androiddeployqt from qt path.

Change-Id: I085f2b20d1f53e3f5caf0b208f64a75c26a89219
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Android: Add uninstall option.

Uninstall option will uninstall the test afer has been executed.
It is useful when you are using your own phone to execute the tests.

Change-Id: I2a3f6c3a93099d70c98f9ce059da22c409b55843
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>