[android] Inline --prep

[jschwartzentruber]

We currently require a setup script (python -m grizzly.target.adb_device.device --prep /path/to/apk) to install the APK before launch.

We should query the device to see if the requested APK is already installed (checking the version), and other steps performed by --prep, so no extra action is needed to launch grizzly or grizzly.replay.